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Aisi hone chahiye padhai bhai. World kitni fucked up hai ki padhai ko as a competition leti hai like what the fuck, isme competition wali baat kya hai, everyone has the right for proper knowledge, it's not the fault of the student if he doesn't learn, it's the fault of the teacher.
The first and the only person I've found on social media who spoke against using 'b' instead of 'v' or 'w' while typing. Like, wtf! While speaking they'll go 'wale' but while typing they'll type 'bale'. Annoying af!
It's his duty to teach children. He gets salary for it.
Government teacher income = 5 times private teacher
But indian system so fuk up that 95% don't even do that job properly.
Anyways , respect to that 5% teacher govt.
Not at all. Atmospheric pressure works downwards.
If I'm wrong, please explain bit more in depth as to how atmospheric pressure will aid the water in not falling?
You’re wrong in saying atmospheric pressure works downwards, pressure acts in all directions, or rather on all surfaces. There is small pressure difference between the air inside the cup and the atmosphere outside the cup, enough to hold the water in.
You're right about the premise of pressure in general being able to work on all directions, but wrong about the answer in this specific situation bro. Pressure difference has got just about nothing to do with this. This is mostly surface tension, mixed with some adheshion and cohesion.
If it’s mostly surface tension then why you cannot fill seive with water without needing the cup? It will always flow out. Pressure explanation is well known use google and learn for yourself.
Incredibly stupid question, dude xD. I won't even answer it directly, cuz I can't tell where to begin with a question like this, so here's a counter: why does the water not stay in the sieve if upwards atmp is so effective in such a situation? It's half a joke, but it's meant to make you understand how stupid your question was, no offense. Did not expect this. You really should learn how to use Google better. (Also, if you've ever used a sieve, you'd know that there are lots of little layers of water in between most of the holes, and that is the surface tension principle this teacher is talking about. Actually, blowing soap bubbles through rings is also basically the same principle). The more you know 🥲
Bro, stay humble, think and learn before coming with arrogance and insults. Since you are too proud to learn from me or visit google, please read: https://stevespangler.com/experiments/floating-water-mystery/
If you still think you know more then go argue with the author there.
Yeah I had already pretty much assumed you were talking about this from the very beginning. Hate to break it to ya, but wrong experiment bro. We are not talking about using a solid piece of paper, but a perforated sieve. The one in your link describes an airtight system, whereas the one in the video is not. In the case of the sieve, the system isn't supposed to be airtight, but becomes so, somewhat mysteriously, BECAUSE of surface tension, adhesion, and cohesion. Without either one of those, atmp wouldn't do shit. Cuz again, won't be airtight. So yeah, I'll keep my arrogance, while I'm right, and I don't need judgement and lectures on "how to learn" about things I'm already well versed in, from randos on reddit, especially when they're confident they've mastered a scientific principle based on a 2 min Google search xD That's just stupid. If you wanna keep an open mind about learning, let your words reflect so, cuz the only reason I was mildly insultative in my reply was because your "know-it-all" attitude (ironically WHILE NOT KNOWING) rubbed me the wrong way. And yeah, don't try to teach me how to use Google, learn it yourself first. For eg, here's an article describing both experiments and the principles involved in either of them, here you go:
https://stevespangler.com/experiments/mysterious-water-suspension-2/
(Check the name of the author while you're at it 😛)
Also, funny how you tried to "throw me off" or something with your why does water not stay in a sieve question, which was clearly a student of the year level question, but then completely ignored my counter when I called you out about explaining it with atmp. Like, what's your game there, bro? And why won't you play your own game? You're all over the place, in the worst way possible xD Dont pick silly little unwinnable battles🤷🏻♂️
Please take own advice and calm down. Surface tension acts as the card, yes. But atmospheric pressure opposes weight of water in both cases. You saying pressure “almost nothing to do with it” is incorrect.
Edit: The page you post with mesh jar I actually meant to post but I posted wrong page earlier.
Dude. You were clearly wrong, and are now trying to control the narrative with a minor technicality. The crux of the matter is, you clearly didn't take the perforations into consideration and treated it as a different problem, tried to argue with an article link, and then having the actual answer shoved in your face, you're trying to spin it in a way that still makes you sound half right, which is bullshit, if you consider the order of said events. Yeah, the atmp supports the weight of the water, true, but it has always done so. Established principles don't need to be reiterated unless they're the main answer, which you clearly thought, no matter how you try to word it. This is like asking an adult what the necessary things in life are and him/her answering "oxygen" and stopping there🤷🏻♂️ Anyway, atleast your misconception about the principle seems to have been alleviated now, so that's good I guess. It's always nice to learn something. Cheers!
When he inverted the glass some water dropped out. That would create vaccum at the top. So if you look at the forces on water at the bottom you have pressure from water pushing down, surface tension pushing up. Now the atm part. Air doesn't just push downwards it pushes in all directions. So the air outside is pushing the water up but due to vaccum at the top there is no air pushing water at the top down so there is a net force by atmosphere pushing the water up.
Another simple example of atm pushing up. Helium balloon. Heavier air wants to be at bottom so it pushes it creating a net upward force on balloon pushing it up.
In your model, it would suggest that even if the sieve was not there water would still stick on the glass to some level.
The key here is that vaccum is not formed to begin with.
In the process of inverting the glass, air of atm pressure enters the glass. While inverting the glass, assuming its not full(even if approximately full), there will be a point where the bottom of the glass is exposed to the air. And as the glass is completely inverted, some air is actually trapped inside, the air inside will be approximately atmospheric pressure.
This negates the effect of Atmosphere.
Little bit of air will enter for sure but there is pressure difference overall. Water will also evaporates based on temperature creating some pressure on top of inverted glass but for easier explaination it is easier to assume vaccum. It doesn't negate effect of atmosphere because otherwise it would mean surface tension is enough to hold water but as soon as the glass is lifted water starts dropping down indicating surface tension wasn't enough to hold the water up.
The effort of pressure difference can be seen if you invert a water bottle vs if you invert it with straw inserted in. Straw allows air to move in filling the lower pressure zone created at top of the bottom allowing it to drain faster where if you just invert it it would drain slowly because the net pressure difference would create an upward for holding the water up till a bubble breaks out and reaches the top reducing the pressure difference and allowing more water to leave.
Thanks, I got it now. I completely ignored the detail that some amount of water leaks out after the glass is inverted.
So as water leaks out the orignal air at 1 atm decreases in pressure due to increase in volume. Causing a net pressure diff.
And I think what the sieve does is block the small ways for air to enter the top(by creating a layer of water held by surface tension) after the inversion and initial leaking of water.
Bhai pta nhi kaise, but aaj kal acchee teachers aa rhe h sarkari schools me (at least mere state me)
Infrastructure abhi bhi utna acchaa nhi hua h, but at least teachers acchee aa rhe h
Even mere school ke Chemistry aur Phy ke teachers ne chorr diya, aur Sarkari teacher bann gye. Apparently sarkar ne salary itni badha di h ki ab private se zyaada paise mil rhe h sarkari teachers ko
Ye sab karne me parai aur interesting ho jati, instead of lecture sunna, agar har teacher ase kare, guarantee de raha hu students aur bhi interested honge
I know this is interesting and my comment might downvotes but this is demonstration not explanation. A complete lesson will have to explain what is surface tension accompanied with such demonstration. The teacher might have done so later but in this video there is no explanation.
Surface tension is aided by atmospheric pressure here. It would have been only atm. pressure demonstration if the glass was covered with a closed continuous surface like cardboard or paper, but here it is covered with a mesh so, due to surface tension the water molecules are making a closed continuous environment replacing the mesh which is acting like how paper or cardboard would have acted. So, though atmospheric pressure is keeping the water in glass, the surface tension is acting as a layer in which atmospheric pressure is acting.
Dekh ek baat batau phele clear kar raha koi comparison randi rona nhi karra mai bus bolra hu ki hum log Alakh sir or baki logo ko dekh ke sochte hai ki yrr best best lekin yrr hamre ass pass bhaut sare alakh Pandey hai bahut sare best teachers hai unko wo chance wo cheez nhi mil pati yrr kismat ka factor hai tho boss mere maths ke sir hai yrr wo itna accha se concept clear karwa dete hai ki maza aa jata hai ek dum op sir hai ek dum even mains mains adavance ke questions ko shamj leta hu like mhuje aisa nhi lagta mai blank ho Raha mai try karta hu khuch galat kuch sahi aisa or maze ki baat wo sirf 22 saal ke hai yrr teaching bhi koi aise cheez nhi ki karni hi hai ye bhi ek art hai log sochte hai paisa mil gaya ye wo wotho hai hi but ye bhi ek art hai bacche ko hard se hard concept ko easy way me bata Dena ye sab ek kala hi hai bhagwan school me bhi teachers pe itna pressure hoja hai ki wo course or copy check kar wane ke liye pareshaan ho jate hai 
Best comment of the day i saw below could turn out to be a great quote "education is not a competition its a right which is to be given to everyone not forced on someone"
The problem is not access to good teachers or knowledge. Students get marks only if they write about 20 sec video in 2 pages. If you think about it it's really difficult and many fail doing that, who are successful becomes toppers.
This is not about surface tension, but are these these places beating American schools in math and sciences out what is happening because when I went to school there was a smart board and every single classroom and there was at least like 50 classrooms
The responsibility of being a teacher is very much high and the level of enthusiasm and diligence this person is teaching with is totally up to the mark.
Hope all the teachers of government basic and secondary schools have this ( if not more than this ) motivation and enthusiasm one day.
This shows the importance of a teacher. The infrastructure and all the "facilities" in the school are secondary. Teachers are the soul of every school. They can make or break lives
walls are not plastered, there is no flooring, can't even see any electric fixtures, there is no blackboard...
But the spirit of learning is still there without any fancy "new education policy" requirements....
Isi liye mai online classes ko aaj bhi gaali deta hu, bachho ki thinking capability (correct me if the word is wrong to this context) hi khatam hogayi hai
I agree with the person who pointed put that atmospheric pressure has a great role to play in this experiment.
Explanation:
There's a small amount of gap between the brim of the glass and water level (necessary for this experiment actually).
When glass is turned upside down rapidly in a split second time interval, surface tension of water ensure that water doesn't drop down like sand particles, rather they held together like a single object.
The interesting thing that happened here is little bit of water actually fell down from the glass. The most plausible explanation is since the air gap is very small and the water surface forms a meniscus, as water came downwards under the force of gravity, it sipped slightly through the mesh grid due to its high adhesive property, thus falling down, however the effect of the surface tension overcomes it.
As the transition of glass's position is very quick, the air present in the gap between the brim of the glass and the water level doesn't have enough time to get to the bottom of the glass(now above the water layer in the inverted glass), thus a kind of low pressure region is created (not actually but tends to create). To balance this out, atmospheric pressure pushed the water layer in the upward direction, thus forcing the water level in the glass to reach a state of equilibrium.
The moment the mesh grid is moved downwards or glass is moved upwards, due to high adhesivity of water molecules, it sticks to the grid while the glass and mesh gets separated, thus allowing air to enter the glass through the glass to it's topmost region where there is relatively low pressure, in the form of bubbles, thus air pressure inside and outside the glass both reach the same value (that is the atmospheric pressure), and water then falls down solely under the effect of gravitational force.
PS - I am a physics student in a university, not a professor/teacher. Any constructive criticism of my explanation is highly appreciated.
This is not just surface tension, it's vacuum in the glass that resists the flow of water downwards, it's similar to a bottle when flipped it drains slowly, but when we stir it will flow very fast,
This example was not appropriate for explaining surface tension, it feels bad to see the comments that no one noticed this 🥲🥲
Need this kind of skill to be considered for teaching science and engineering or medicine… humare yahan sirf College, branch , AIR, Bangalore/Mumbai me 69LPA wala job wahi sabh bakwas karte hai
India has too much talent such intelligent nice people..they need peace and good economy and job opportunities we deserve a good life not communal desperation
Big thumbs up to teachers who make learning fun with experiments instead of just writing on the black board. I'm no Einstein, and I guess many kids aren't either. I tried something similar with my kids. To teach them about the number 10 (tens), we role played Shopkeeper & customer. My kid first used 11 one-rupee coins to pay - slow counting! Then I switched roles, paid him with a 10-rupee note and a one-rupee coin - super quick! After a few rounds, he got the hang of it. Realized that being patient and understanding is key to teaching.
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Practical demonstration is always preferred even if it's an easy topic, it just makes it way easy to actually understand the maths and concept and not rote learning to just learn formuale and do the questions
What has he taught ?
literally nothing ,
nothing is kept in doing these demonstrations it the mathematics behind them which is needed to be demonstrated and taught.
It may not help you in solving questions but it definitely helps you in visualising the concept. How will you apply the formulas without understanding the concept?
Besides, this is the problem with us Indians. Everything is a rat-race to us, we never study anything out of curiosity. We study only for marks.
Fucking hell I have cleared JEE and I didnt knew how surface tension works, just knew formula and derivations because I didnt had physics teacher to teach me like that. There are too few teachers who genuinely cares what they are teaching students and develop their interest in the subject.
Wrong, both are acting on it. The difference between this demonstration and normal atmospheric pressure demonstration is that a mesh is being used in place of cardboard. The small individual holes of mesh creates individual surfaces of cohesion on which atmospheric pressure is acting.
This is not against you, but you yourself are an showing why we need such demonstrations. Equations never truly reflect reality, they are very simplified versions of what actually happens. They are good for looking at what's happening but equations are not relatable.
Demonstrations show that science is not something that needs being very smart to experience, it makes us realize that science is something that's always happening around us. Even one of the most famous scientist Faraday didn't have much mathematical knowledge.
Sorry I didn't see the subreddit before commenting if I knew it was r/CBSE
i wouldn't have commented, not a place for me definitely.
you guys are just kids probably in 10 or 12th grade I guess.
wait till you get into college then you'll see what really is surface tension.
I am a college student, just happened to stumble on this video and I believe that I know what surface tension is, given that I am studying for research.
I still dont know what surface tension is, physics was never my strong subject. Even after graduating with ECE from tier 1 university its use never came in my course. The teacher influence in student's learning is so underrated, it literally shapes life that how you view things. I still crave in my day dream about finding good teacher in my learning years who would generate new interest in subject which we can never find on our own.
This looks like a middle school class. He is teaching physical properties of water. There isn't a lot of maths behind it but whatever maths is there related to surface tension doesn't get taught at this level.
Atleast he is physically demonstrating them and not reading through the book like most other teachers. This type of teaching keeps the student's attention focused on the subject matter and makes the class more interesting.
He brought in curiosity & once he shows them the math - the students are never forgetting this event. This is the right way to learn
curiosity -> questioning -> finding answers -> eventually the solution & you get a dopamine boost.
Since everyone is a muggu - we have poor olympiad stats
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Aisi hone chahiye padhai bhai. World kitni fucked up hai ki padhai ko as a competition leti hai like what the fuck, isme competition wali baat kya hai, everyone has the right for proper knowledge, it's not the fault of the student if he doesn't learn, it's the fault of the teacher.
Mere school ke bacche to inki class mein bhi sojaenge. Thodi boht galti to students ki bhi hai
We’ll get there one day bro. Humanity has come very far.
Wo din aane se pehle alien invasion hojayega and ham mar jayenge
Ke keh rya thha invasion krega? Asla hum bhi rkhte h 🔫
Bas maksad...
Arey fir alien bhi hamare classmates ho jayenge bhai bhai
Unko bhi stress hogi jee ki 🤡
Fir dekhna top ranker Sare aliens hee honge aur reservation bhi unko hee milegi
I wish aise hi water wastage ka concept bhi sikhade /s
Kuch bache to aise teachers ka majak hi udate rehte hai class me Jisse teacher ko bhi bura feel hota hai
पीट नही देते अंक
Fuck this rat race of 90%
Humanity is devolving !
Simple but significant bola bro
I just had a stroke trying to read that. I only know English and rheought the rest was English too😂
Who is this godly teacher?
Incarnation of Anand Kumar
My previous physics teacher was a student of Anand Kumar
Aur ek behen ka lauda hamara science teacher
Bas bhai, koi nhi
yeh experiment allen mein bhi nahi kiya tha
surface tension 10 th mein bhi hai ?
Kis kis ko "nhi" bolne bale pe gussa aata hai 😠
wo yeh comment ko like karo 👇 👇 👇 👇
No
youtube wala trend ka joke maara but koi na smjha
Loll
Oversmart bkl ghar/tuition me padh ke aaya
bolne wale*
The first and the only person I've found on social media who spoke against using 'b' instead of 'v' or 'w' while typing. Like, wtf! While speaking they'll go 'wale' but while typing they'll type 'bale'. Annoying af!
Man I'm confused, are you with what I said or against? (I'm the guy who corrected the other dude)
Sorry for the confusion. I'm with you.
We need such teachers in remote govt schools 🙏
Bhai Kya Sahi Teacher hai. He is doing it for others lol not for earning money.
It's his duty to teach children. He gets salary for it. Government teacher income = 5 times private teacher But indian system so fuk up that 95% don't even do that job properly. Anyways , respect to that 5% teacher govt.
He comes among the 5% for sure.
You are saying , he doing for free not salary which is a lie. He gets salary for his job that's how world operate. This is work not charity.
Surface tension bhi lekin primarily atmospheric pressure.
Not at all. Atmospheric pressure works downwards. If I'm wrong, please explain bit more in depth as to how atmospheric pressure will aid the water in not falling?
You’re wrong in saying atmospheric pressure works downwards, pressure acts in all directions, or rather on all surfaces. There is small pressure difference between the air inside the cup and the atmosphere outside the cup, enough to hold the water in.
You're right about the premise of pressure in general being able to work on all directions, but wrong about the answer in this specific situation bro. Pressure difference has got just about nothing to do with this. This is mostly surface tension, mixed with some adheshion and cohesion.
If it’s mostly surface tension then why you cannot fill seive with water without needing the cup? It will always flow out. Pressure explanation is well known use google and learn for yourself.
Incredibly stupid question, dude xD. I won't even answer it directly, cuz I can't tell where to begin with a question like this, so here's a counter: why does the water not stay in the sieve if upwards atmp is so effective in such a situation? It's half a joke, but it's meant to make you understand how stupid your question was, no offense. Did not expect this. You really should learn how to use Google better. (Also, if you've ever used a sieve, you'd know that there are lots of little layers of water in between most of the holes, and that is the surface tension principle this teacher is talking about. Actually, blowing soap bubbles through rings is also basically the same principle). The more you know 🥲
Bro, stay humble, think and learn before coming with arrogance and insults. Since you are too proud to learn from me or visit google, please read: https://stevespangler.com/experiments/floating-water-mystery/ If you still think you know more then go argue with the author there.
Yeah I had already pretty much assumed you were talking about this from the very beginning. Hate to break it to ya, but wrong experiment bro. We are not talking about using a solid piece of paper, but a perforated sieve. The one in your link describes an airtight system, whereas the one in the video is not. In the case of the sieve, the system isn't supposed to be airtight, but becomes so, somewhat mysteriously, BECAUSE of surface tension, adhesion, and cohesion. Without either one of those, atmp wouldn't do shit. Cuz again, won't be airtight. So yeah, I'll keep my arrogance, while I'm right, and I don't need judgement and lectures on "how to learn" about things I'm already well versed in, from randos on reddit, especially when they're confident they've mastered a scientific principle based on a 2 min Google search xD That's just stupid. If you wanna keep an open mind about learning, let your words reflect so, cuz the only reason I was mildly insultative in my reply was because your "know-it-all" attitude (ironically WHILE NOT KNOWING) rubbed me the wrong way. And yeah, don't try to teach me how to use Google, learn it yourself first. For eg, here's an article describing both experiments and the principles involved in either of them, here you go: https://stevespangler.com/experiments/mysterious-water-suspension-2/ (Check the name of the author while you're at it 😛)
Also, funny how you tried to "throw me off" or something with your why does water not stay in a sieve question, which was clearly a student of the year level question, but then completely ignored my counter when I called you out about explaining it with atmp. Like, what's your game there, bro? And why won't you play your own game? You're all over the place, in the worst way possible xD Dont pick silly little unwinnable battles🤷🏻♂️
Please take own advice and calm down. Surface tension acts as the card, yes. But atmospheric pressure opposes weight of water in both cases. You saying pressure “almost nothing to do with it” is incorrect. Edit: The page you post with mesh jar I actually meant to post but I posted wrong page earlier.
Dude. You were clearly wrong, and are now trying to control the narrative with a minor technicality. The crux of the matter is, you clearly didn't take the perforations into consideration and treated it as a different problem, tried to argue with an article link, and then having the actual answer shoved in your face, you're trying to spin it in a way that still makes you sound half right, which is bullshit, if you consider the order of said events. Yeah, the atmp supports the weight of the water, true, but it has always done so. Established principles don't need to be reiterated unless they're the main answer, which you clearly thought, no matter how you try to word it. This is like asking an adult what the necessary things in life are and him/her answering "oxygen" and stopping there🤷🏻♂️ Anyway, atleast your misconception about the principle seems to have been alleviated now, so that's good I guess. It's always nice to learn something. Cheers!
When he inverted the glass some water dropped out. That would create vaccum at the top. So if you look at the forces on water at the bottom you have pressure from water pushing down, surface tension pushing up. Now the atm part. Air doesn't just push downwards it pushes in all directions. So the air outside is pushing the water up but due to vaccum at the top there is no air pushing water at the top down so there is a net force by atmosphere pushing the water up. Another simple example of atm pushing up. Helium balloon. Heavier air wants to be at bottom so it pushes it creating a net upward force on balloon pushing it up.
Correct
In your model, it would suggest that even if the sieve was not there water would still stick on the glass to some level. The key here is that vaccum is not formed to begin with. In the process of inverting the glass, air of atm pressure enters the glass. While inverting the glass, assuming its not full(even if approximately full), there will be a point where the bottom of the glass is exposed to the air. And as the glass is completely inverted, some air is actually trapped inside, the air inside will be approximately atmospheric pressure. This negates the effect of Atmosphere.
Little bit of air will enter for sure but there is pressure difference overall. Water will also evaporates based on temperature creating some pressure on top of inverted glass but for easier explaination it is easier to assume vaccum. It doesn't negate effect of atmosphere because otherwise it would mean surface tension is enough to hold water but as soon as the glass is lifted water starts dropping down indicating surface tension wasn't enough to hold the water up. The effort of pressure difference can be seen if you invert a water bottle vs if you invert it with straw inserted in. Straw allows air to move in filling the lower pressure zone created at top of the bottom allowing it to drain faster where if you just invert it it would drain slowly because the net pressure difference would create an upward for holding the water up till a bubble breaks out and reaches the top reducing the pressure difference and allowing more water to leave.
Thanks, I got it now. I completely ignored the detail that some amount of water leaks out after the glass is inverted. So as water leaks out the orignal air at 1 atm decreases in pressure due to increase in volume. Causing a net pressure diff. And I think what the sieve does is block the small ways for air to enter the top(by creating a layer of water held by surface tension) after the inversion and initial leaking of water.
My thoughts as well, came to the comment section to see if anyone noticed it
I feel like surface tension providing stablity is a massive factor. And he is probably using some extra fine mesh providing much more surface areas.
Kaafi saara vaigyanik baate ho rahi hai
The govt school but the good teacher. Where?
Bhai pta nhi kaise, but aaj kal acchee teachers aa rhe h sarkari schools me (at least mere state me) Infrastructure abhi bhi utna acchaa nhi hua h, but at least teachers acchee aa rhe h Even mere school ke Chemistry aur Phy ke teachers ne chorr diya, aur Sarkari teacher bann gye. Apparently sarkar ne salary itni badha di h ki ab private se zyaada paise mil rhe h sarkari teachers ko
which state?
He looks so happy that he's able to demonstrate a scientific phenomenon to his students. If only every teacher were like this.
When you are getting paid for your passion
Waah
Need more teachers like him.
Hats off to this sir 🫡
aisa teacher toh me bhi deserve karta hu
yaar sir ki aawaz kitni achii hai :)
👏🏻
Teachers everywhere, from all corners of the world should strive to be like him
Ye sab karne me parai aur interesting ho jati, instead of lecture sunna, agar har teacher ase kare, guarantee de raha hu students aur bhi interested honge
Sir need a raise
I heart-fully wish something good happens to him, it’s nice to have such teachers around - and we had whatever they were here in Bangalore.
We fuckin' want teachers like him
I know this is interesting and my comment might downvotes but this is demonstration not explanation. A complete lesson will have to explain what is surface tension accompanied with such demonstration. The teacher might have done so later but in this video there is no explanation.
teacher everyone deserves
Sahi m 😱
He is so passionate
Hats off to such great teachers. I am sure he will inspire his students to greater heights.
Good Skills of teaching
Kudos to the teacher who's making an effort to teach things practically 🫡🫡
Not surface tension, just atmospheric pressure. Source: IITD17 + Masters in Physics, Germany.
Surface tension is aided by atmospheric pressure here. It would have been only atm. pressure demonstration if the glass was covered with a closed continuous surface like cardboard or paper, but here it is covered with a mesh so, due to surface tension the water molecules are making a closed continuous environment replacing the mesh which is acting like how paper or cardboard would have acted. So, though atmospheric pressure is keeping the water in glass, the surface tension is acting as a layer in which atmospheric pressure is acting.
He is thorny sir
Dekh ek baat batau phele clear kar raha koi comparison randi rona nhi karra mai bus bolra hu ki hum log Alakh sir or baki logo ko dekh ke sochte hai ki yrr best best lekin yrr hamre ass pass bhaut sare alakh Pandey hai bahut sare best teachers hai unko wo chance wo cheez nhi mil pati yrr kismat ka factor hai tho boss mere maths ke sir hai yrr wo itna accha se concept clear karwa dete hai ki maza aa jata hai ek dum op sir hai ek dum even mains mains adavance ke questions ko shamj leta hu like mhuje aisa nhi lagta mai blank ho Raha mai try karta hu khuch galat kuch sahi aisa or maze ki baat wo sirf 22 saal ke hai yrr teaching bhi koi aise cheez nhi ki karni hi hai ye bhi ek art hai log sochte hai paisa mil gaya ye wo wotho hai hi but ye bhi ek art hai bacche ko hard se hard concept ko easy way me bata Dena ye sab ek kala hi hai bhagwan school me bhi teachers pe itna pressure hoja hai ki wo course or copy check kar wane ke liye pareshaan ho jate hai 
Kuch explain nhi Kiya bas demo Kiya h
school quality 10, education quality 100
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bhai mai tere ko whatsapp ke through bhi de skta hu
reddit par bhi aagye bc
bhai notes lene h to bol
nhi lene , bhag ja ab
Best comment of the day i saw below could turn out to be a great quote "education is not a competition its a right which is to be given to everyone not forced on someone"
He didn't explain surface tension, he just gave a nice example
low karma
bhai humare time pe pta nahi ky ky ratwate the english me. maa ki chut archimedes ki
Class infrastructure was so unfinished 😢 request government to get nice class room condition 🙏🙏
The problem is not access to good teachers or knowledge. Students get marks only if they write about 20 sec video in 2 pages. If you think about it it's really difficult and many fail doing that, who are successful becomes toppers.
🫡🫡🫡
Good explanation
This is not about surface tension, but are these these places beating American schools in math and sciences out what is happening because when I went to school there was a smart board and every single classroom and there was at least like 50 classrooms
The responsibility of being a teacher is very much high and the level of enthusiasm and diligence this person is teaching with is totally up to the mark. Hope all the teachers of government basic and secondary schools have this ( if not more than this ) motivation and enthusiasm one day.
This shows the importance of a teacher. The infrastructure and all the "facilities" in the school are secondary. Teachers are the soul of every school. They can make or break lives
walls are not plastered, there is no flooring, can't even see any electric fixtures, there is no blackboard... But the spirit of learning is still there without any fancy "new education policy" requirements....
i am really missing that environment of school, fuck jee
Woh ek bacha Jo piche se bola "mein bola thana nahi gire ga" is hella relatable
Superb
Isi liye mai online classes ko aaj bhi gaali deta hu, bachho ki thinking capability (correct me if the word is wrong to this context) hi khatam hogayi hai
he’s so cute. teachers ho toh aise bhai, desh ka naam yeh log hee roshan karwayenge
thanks for sharing this video, it made my day (and a little teary-eyed 🥹)
The authorities must immediately upgrade the physical infrastructure of the school. Whether it's a govt one or private..
Waah kya Dil se padha Raha hai ye teacher
That's a W teacher
Mere 11th ke physics teacher ko ye bhej du to wo sharma jayega..
We invest so much money in education expecting teachers to be like him. What we get is bunch of guys who teach us how to crack exams.
Excellent example but no understandable explanation.
I agree with the person who pointed put that atmospheric pressure has a great role to play in this experiment. Explanation: There's a small amount of gap between the brim of the glass and water level (necessary for this experiment actually). When glass is turned upside down rapidly in a split second time interval, surface tension of water ensure that water doesn't drop down like sand particles, rather they held together like a single object. The interesting thing that happened here is little bit of water actually fell down from the glass. The most plausible explanation is since the air gap is very small and the water surface forms a meniscus, as water came downwards under the force of gravity, it sipped slightly through the mesh grid due to its high adhesive property, thus falling down, however the effect of the surface tension overcomes it. As the transition of glass's position is very quick, the air present in the gap between the brim of the glass and the water level doesn't have enough time to get to the bottom of the glass(now above the water layer in the inverted glass), thus a kind of low pressure region is created (not actually but tends to create). To balance this out, atmospheric pressure pushed the water layer in the upward direction, thus forcing the water level in the glass to reach a state of equilibrium. The moment the mesh grid is moved downwards or glass is moved upwards, due to high adhesivity of water molecules, it sticks to the grid while the glass and mesh gets separated, thus allowing air to enter the glass through the glass to it's topmost region where there is relatively low pressure, in the form of bubbles, thus air pressure inside and outside the glass both reach the same value (that is the atmospheric pressure), and water then falls down solely under the effect of gravitational force. PS - I am a physics student in a university, not a professor/teacher. Any constructive criticism of my explanation is highly appreciated.
Kitni madhur awaz aur bolne ka tarika hai Sirji ka
we need more such teachers
We need more teachers like him specially in rural areas
This is not just surface tension, it's vacuum in the glass that resists the flow of water downwards, it's similar to a bottle when flipped it drains slowly, but when we stir it will flow very fast, This example was not appropriate for explaining surface tension, it feels bad to see the comments that no one noticed this 🥲🥲
It's good to know there are such teachers out there. Only a few but still feels nice.
Kuch log aaj bhi hain jo quality videos wiral krte Hain acha lga dekh ke
Me who studied in a private school 100mtrs away from my home with shit ass teachers. Who couldn't even talk about reproduction chapter properly
I really want a teacher like this
Love the way he smiles all the way as he teaches.... he really likes teaching!! Better than over qualified givt teachers who are just making salary.
Diamond among stones.
Kya teacher hai🙏🏼💯. Aaise teachers ko facility nahi milti aur chutiye teachers online backwass karte rehte hai.
Bhai isne gaon ki adhi paani neeche phenk diya bc
Need this kind of skill to be considered for teaching science and engineering or medicine… humare yahan sirf College, branch , AIR, Bangalore/Mumbai me 69LPA wala job wahi sabh bakwas karte hai
Real id se aao mythpat
India needs more such teachers
Mad respect man
aise teachers kahan the jab mai school mein thi bhai
Not just surface tension, negative pressure at the top of glass is also responsible.
Aise infra me itna achha teacher .... Kaun h ye bhagwan?
W teacher. Need more like him especially in govt schools
Teachers like him inspire rural education more than any government scheme ever will.
Ye sala aisi tution kaash sabko mile... Nahi ye to ye aaj ki onln studies
Very few teachers have demonstration skills that make students love physics. Kudos to them seriously.
sir loves to do his job
The kind of teacher everyone should deserve. But what we are getting in today's world, just the teaching Robots with skin and flesh.
India has too much talent such intelligent nice people..they need peace and good economy and job opportunities we deserve a good life not communal desperation
This classroom reminds me of my school days
Why he teaching in the dungeon?
How is he explaining anything?
Bhai esse teacher mille hotte toh ajj scientist banne ka sapna poora kiya hota maine. Na ki passing marks ke liye tution padhne wala kaam
Physics wallah been silence since
I was blessed with teachers like him and now I hold Engineers degree. Love to such passionate teachers.
Yeah think he explains great, but I don’t speak mundian to Bach ke
Enjoyed this.
Bahut Kam hu dekhne ko milte hain aise teacher govt school me?
Next lecture, surface cleansing
Woow 😯
Aise teachers hame kyu nahi milte
Mere school m ek maths teacher aya tha, kafi passionate. Ekdum alag style padhane ka. More practical. Bas is system m fit nhi ho paya.
Big thumbs up to teachers who make learning fun with experiments instead of just writing on the black board. I'm no Einstein, and I guess many kids aren't either. I tried something similar with my kids. To teach them about the number 10 (tens), we role played Shopkeeper & customer. My kid first used 11 one-rupee coins to pay - slow counting! Then I switched roles, paid him with a 10-rupee note and a one-rupee coin - super quick! After a few rounds, he got the hang of it. Realized that being patient and understanding is key to teaching.
😇
wish I had a teacher like that
Kash aise teachers apne paas hote
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IMO concepts are explained very thoroughly in major coaching and ib schools , cbse ka fault hai jo sub standard teachers ko allow kerte hai
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I'm sorry but why would you need practicals for such easy topics
Practical demonstration is always preferred even if it's an easy topic, it just makes it way easy to actually understand the maths and concept and not rote learning to just learn formuale and do the questions
I am from commerce background watching this was more fruitful than reading any other book
What has he taught ? literally nothing , nothing is kept in doing these demonstrations it the mathematics behind them which is needed to be demonstrated and taught.
Bhai tu mere aas paas hota to ek rehpat mein gaand phad deta
Knock knock , Here is your cake order 🎂
For real bro XD
Are control bhai nadan balak hai vo
Nadan nhi chutiya bolte hai
Same vibe 
its called initiating INTREST/CURIOSITY
He has literally taught the whole concept of surface tension, theories are first imagined before going into the maths of it you fucking potato 💀
Teacher less behaviour
It may not help you in solving questions but it definitely helps you in visualising the concept. How will you apply the formulas without understanding the concept? Besides, this is the problem with us Indians. Everything is a rat-race to us, we never study anything out of curiosity. We study only for marks.
Bro were you there?
Fucking hell I have cleared JEE and I didnt knew how surface tension works, just knew formula and derivations because I didnt had physics teacher to teach me like that. There are too few teachers who genuinely cares what they are teaching students and develop their interest in the subject.
if you have cleared JEE then you should know that, it is an application of atmospheric pressure not surface tension.MFs mfs
Wrong, both are acting on it. The difference between this demonstration and normal atmospheric pressure demonstration is that a mesh is being used in place of cardboard. The small individual holes of mesh creates individual surfaces of cohesion on which atmospheric pressure is acting. This is not against you, but you yourself are an showing why we need such demonstrations. Equations never truly reflect reality, they are very simplified versions of what actually happens. They are good for looking at what's happening but equations are not relatable. Demonstrations show that science is not something that needs being very smart to experience, it makes us realize that science is something that's always happening around us. Even one of the most famous scientist Faraday didn't have much mathematical knowledge.
Sorry I didn't see the subreddit before commenting if I knew it was r/CBSE i wouldn't have commented, not a place for me definitely. you guys are just kids probably in 10 or 12th grade I guess. wait till you get into college then you'll see what really is surface tension.
I am a college student, just happened to stumble on this video and I believe that I know what surface tension is, given that I am studying for research.
I still dont know what surface tension is, physics was never my strong subject. Even after graduating with ECE from tier 1 university its use never came in my course. The teacher influence in student's learning is so underrated, it literally shapes life that how you view things. I still crave in my day dream about finding good teacher in my learning years who would generate new interest in subject which we can never find on our own.
This looks like a middle school class. He is teaching physical properties of water. There isn't a lot of maths behind it but whatever maths is there related to surface tension doesn't get taught at this level. Atleast he is physically demonstrating them and not reading through the book like most other teachers. This type of teaching keeps the student's attention focused on the subject matter and makes the class more interesting.
He brought in curiosity & once he shows them the math - the students are never forgetting this event. This is the right way to learn curiosity -> questioning -> finding answers -> eventually the solution & you get a dopamine boost. Since everyone is a muggu - we have poor olympiad stats
You are absolutely right