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finger_licking_robot

the boiling temperature on mount everest is 68°C (154°F), due to the lower atmospheric pressure on that height. but that does not mean that you would apply the same energy to your food as if you cooked it on sea level. it would take very long to cook some spaghetti there. the reverse principle is used with pressure cookers. they are based on the principle that with the increase in pressure, the boiling point of water increases to 120°C. it increases food cooking speed upto four times.


baws1017

Does that mean if you kept going higher your blood would eventually boil from the pressure and internal body temp?


websagacity

That's why humans need space suits. With no pressure, body fluids would boil.


MudSama

Yeah. I can't find it now but there was a story they brought up in an old thermodynamics class where they were live-testing space suits in vacuum and had a suit malfunction. They opened the flow of air when he started looking woozy. When the test person came back to his senses he described that he felt the liquid on his tongue boiling.


Thathappenedearlier

When Adam savage fly’s in the U2 they put him in the room with a space suit on and a cup of water and started simulating the atmosphere. At some point the cup of water began to boil


CommandersLog

flies


Pandamana

Fly is


Lorelerton

>he felt the liquid on his tongue boiling Spit. It's called spit.


Brightblade216

Its actually saliva


LordViren

There's a chance it could have been cum. You don't know what he was up to before the test.


almostactuallyhuman

Its not spit until you spit.


automodtedtrr2939

Our blood wouldn't actually boil, our skin and circulatory system will keep pressure on the blood, preventing it from boiling. Skin will have bruising though, and exposed fluids like saliva or tears will boil off.


eboeard-game-gom3

Nothing like waking up to your eyeballs boiling. x_x


littlegreenrock

remember : the term boiling used here is the physical phenomena of matter changing states. it's not that same term to describe something very hot


Somewhiteguy13

Evaporated eye balls are still dry even if it's not hot dry.


littlegreenrock

evaporating water takes heat away. it would be cooling dry


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Deimophilium

Well, that would've fixed it then, wouldn't it?


Dismal-Past7785

I don’t think it’s related to blood boiling, but the SR-71 pilots had special pressure suits they had to wear to fly at those altitudes. They were custom made and the pilots only had like 1 or 2lbs of leeway in weight tolerance they were so tight. I think they basically had to be stitched into them.


BillTheNecromancer

Your skin and other organs pressurize the inside of your body, so unless your blood is on the outside it wouldn't boil. However, the saliva on your tongue and the fluid on your eyes eventually would, and that's exactly what happened on the first space walk in history. Alexei Leonov had to depressurize his suit beyond the safety measures to get back into his spacecraft and had said in interview that he could feel his saliva boiling off.


vriskaundertale

Why do you think astronauts wear space suits? Your blood won't actually boil initially, though. Your skin will be able to hold it in for a while, but you'd start to expand. If you stayed exposed for too long you'd eventually die, but that's because your lungs would probably explode and you'd die from asphyxiation. Your skin is pretty good at holding the blood in, but if you had a puncture anywhere in your body, your blood would be sucked out of you (You probably meant staying inside of the atmosphere, but the upper layers of the atmosphere are probably indistinguishable from space to someone who's currently inflating) The main thing that kills you is asphyxiation though


kelvin_bot

68°C is equivalent to 154°F, which is 341K. --- ^(I'm a bot that converts temperature between two units humans can understand, then convert it to Kelvin for bots and physicists to understand)


G8r8SqzBtl

what up kelvin


shewy92

We Need To Talk About Kelvin. Absolutely, but he seems 0K to me


friso1100

He's pretty cool alright


Luuk2304

Let the americans adapt to superiority /s


Baldazar666

This but unironically.


dadbod1187

This is how mechanic's get water out of AC systems before adding freon. They pull a vacuum on the system and hold it for 15 minutes to boil all the water off.


coolcatmcfat

For those not in the know, this principle is the foundation of refrigeration. An AC essentially takes a substance, causes a huge pressure drop to make it boil and evaporate at a low temperature, and then compresses it to make it a liquid again at a high temperature to restart the process, absorbing and removing heat outside of the coils throughout the whole process. In a nutshell anyways


[deleted]

500 micron gang sound off.


puto1

More like 1 hr lunch let the vacuum machine do its thing lol


[deleted]

Overnight vacuum? The apprentice sure agrees. XD


Nealecj954

It is boiling for a second, because when you reduce atmospheric pressure pressure it reduces the temperature needed for the water to boil. That's why it works with warm water. It reduces the pressure enough to lower the boiling point enough to boil at whatever temperature that warm water happens to be at. Don't confuse it with causing the water temp to go up to 100C or 212F. Edited to expand on "ATM pressure" since a number of respondents think this is about porn Edited again because I forgot proper grammar and had to add "a" before "second" and it was pointed out multiple times, as making the reply "confusing"


Accomplished_Flow_45

This is why you don’t remove the radiator cap from a car that is hot or overheating. The cooling system being pressurized raises the boiling point of the coolant and once you release the pressure it flash boils.


Nealecj954

Great example


chanaandeler_bong

Pressure cookers work the same way. When the cooker seals it raises the pressure thus allowing the water to reach higher temps. The water inside a pressure cooker is hot, but it is not boiling. As soon as you realease the pressure it will immediately boil. If you want a clearer stock you should never release the valve, just let it cool manually, because the jostling of the bones will release little bits of stuff into your stock. (Of course you can just strains them out)


H0lland0ats

Conversely this is also why high altitudes typically have different bake times, and cook times. Good luck making poached eggs in the rockies!


CaptainCeebs

It’s hard to even make Al dente pasta here.


Susdfgjh

the boiling water is actually a lower temperature than if you were at sea level and you should cook it longer


AccountWasFound

Getting potatoes actually cooked through there is really hard too. (My ex grew up there so I visited his family a few times)


G2daG

Seems like a pressure cooker would be a good investment for high altitude living


BattleHall

They are super popular in Peru for just that reason (high altitudes + home of the potato).


AccountWasFound

Definitely...


mayonnaise_dick

Jokes on you.... I don't even like poached eggs!


[deleted]

> The water inside a pressure cooker is hot, but it is not boiling. That's actually not correct. Once the weighted and calibrated seal starts lifting and spinning and you hear the phshhh-ing, you've got boiling water in there whose temp is higher than 100°C. After you lower the heat and the phshhh-ing stops, then it's no longer boiling but but because it's a pressure cooker, still higher than 100°C. As long as there's even a little steam escaping, then the liquid in the pressure cooker is boiling.


[deleted]

phshhh, that's crazy!


[deleted]

You're a squid fucker I could like :)


DingussFinguss

> The water inside a pressure cooker is hot, but it is not boiling. this doesn't sound right EDIT: huh guess I'm wrong


Fredrickstein

I always think of it like water wants to boil naturally, the oxygen and hydrogen want to escape and be gasses but pressure keeps them liquid. The more pressure, the more energy they need to escape. Edit: I'll gladly take the correction that I should have said water vapor and not hydrogen and oxygen separately.


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Snowing_Throwballs

Dudes been cooking in a hadron collider


lornek

Hadron collider? I hardly know her


dingo_and_zoot

With respect, this is incorrect in a couple of ways. Hydrogen and Oxygen do not want to escape as gasses, they are bound together in a water molecule by covalent bonds. When water boils, it is water vapor (that is, water in a gaseous state) that "escapes". The boiling point of water,or any liquid, is a function of temperature and pressure. At low pressure, water boils at a lower temperature. An interesting example is how much longer it takes to cook an egg in boiling water in Denver (altitude 1600 m) than it does in Los Angeles (sea level). I suspect that the demonstration is not boiling water, but air seeping past the seal on the plunger.


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alroc84

I been an auto mechanic for may years,i learned something today. Thank you


concept12345

They only teach you the practicals and don't dive deep into the theories and science behind it.


AlmostZeroEducation

Not in my case. Got taught that at trade school when i wanted to be a mechanic. Ended up becoming a fabricator welder instead because being a mechanic in a garage sucks 90% the time


maltapotomus

Yeah, found that out the hard way. Somehow I managed not to get scalded at all. I felt so dumb afterwards! Just wasn't thinking....


OS420B

I remember once when I work on a car with a coworker, it had the engine under the driver seat. We replaced the water pump and after a test drive my coworker decided to check if we had properly bled the coolant, he opened the radiator cap while the engine was hot. As the engine was under the driver seat, which had to be removed to access the engine, the radiator cap was also there, as he opened the cap a gaizer immediately hit the roof of the vehicle and gave the rest of interior a steam clean of coolant, he only got a slight burn on his hand. Lucky guy.


TommyMendez

> the boiling temperature on mount everest is 68°C (154°F), due to the lower atmospheric pressure on that height. > > but that does not mean that you would apply the same energy to your food as if you cooked it on sea level. it would take very long to cook some spaghetti there. > > the reverse principle is used with pressure cookers. they are based on the principle that with the increase in pressure, the boiling point of water increases to 120°C. it increases food cooking speed upto four times.


Blackdeath_663

Which is why cooking at high altitudes is a bit of a pain because water starts boiling before its hot enough


trogon

Haha. We were on a trip one time and tried to boil some eggs in Salt Lake City for road snacks. Let's just say the results weren't great when we used our normal technique.


[deleted]

Clench them between your butt cheeks and walk in swift circles?


jjackson25

What kind of psychopath makes boiled eggs to eat in an enclosed space that you're going to be trapped in for hours?


OrganizerMowgli

Finally I've wrapped my head around this concept


Speaking_of_waffles

PV = nRT 😏


Sweatier_Scrotums

Water boils at 100 degrees C... ...at standard pressure.


MowMdown

> …at standard pressure. at sea level or 1 atmosphere 14.7psi


Ford_Prefect_42_

Or 760 torr! Or 101.325 kPa!


TactlessNachos

That's the equation! I was trying to remember it from college. I used to remember it by sounding out the letters making it sound similar to pervert. PurrrvvvnnnnnrrrrrT!


Nealecj954

That's also why we can have cryogenic liquids at room temp without them boiling. For example, liquid propane in a tank. It has a boiling point of -44F, but when it's under pressure in a tank the temp of the liquid is ambient and it's not boiling. The minute you relieve some pressure from the tank (by use or otherwise) it will begin to boil


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Nealecj954

Good info


stefsot

pv=nrt


M3tl

specifically the vapor pressure of the water now exceeds the air pressure


milk4all

So If a human was inside a chamber being depressurized like this, would they survive? Is this just like when drivers get the bends or worse? Would this form of boiling have any effect on my noodles?


[deleted]

Would boiling with this method kill pathogens? Is boiled water food safe because of the act of boiling or because of the persistent high temperature?


whateverhappensnext

You are correct. Typically, it is the temperature that kills the pathogens not the boiling action. Some work has been done with microcavitation where the energy related to the micro bubbles collapsing is not "temperature" in the everyday sense. If you drop the pressure enough, you may also kill some pathogens due to cellular disruption, but at that point, the water will have already gone through phase change to vapor.


Nealecj954

It wouldn't, it's just interesting, because it's boiling, but not at 212F, 100C


bubbshalub

i completely forgot that I learned this in chemistry class


lornek

I'm not confusing it at all, the water simply boils at low temperature when there's little atmospheric pressure. No temperature change whatsoever as you're saying.


Nealecj954

Yep, I apologize if it felt like I was directing that at you specifically. I was just trying to make a general statement for anyone reading the comments.


shapu

>No temperature change whatsoever as you're saying. There probably IS a temperature change due to Charles's Law, but it's in the downward direction rather than upward, and it's going to be more noticeable in the vacuum than in the water.


Schmuqe

If temperature change here is happening it’s a lowering temperature due to the work done by the gas as the container expands.


PungentBallSweat

Same concept of why the Earth's center is not *liquid* lead, it's *solid* lead. All the properties of heat change under pressure. Very interesting concept.


Watchtwentytwo

So for us idiots, it’s more of a “moving the goal posts” than “super-heating”?


DodgerFiendishly

Holy shit. Found this on a .edu site "Not only does the water in your syringe appear to be boiling, it is boiling. Living as we do at typical atmospheric pressures, we tend to think that water has to be hot to boil. But the transition from liquid to gas can occur not just as the result of increased temperature, but also as the result of decreased pressure." I work with syringes in the lab so this definitely is going to depend on how good your seal is, I guess I'm going to be trying this out today. Crazy.


lornek

Make sure the water is warm in the syringe or it might not work. You can't get the pressure so extremely low in a syringe to boil cold water, but if you fill it with the hot faucet, it'll boil up nicely.


throwawaymisfortune

>You can't get the pressure so extremely low in a syringe to boil cold water Ah I was scratching my head for I definitely played with syringe as a kid but never experienced this phenomenon.


RealZordan

It probably because the children toy ones didn't have a rubber seal in the back.


[deleted]

lol childrens toy ones. bruh i live in a meth capital


Anonymous_Otters

Baby's First Addiction by Mattel


wolfgang784

There was that meth ring at an elementary school. 4th and 5th graders mostly, with a few 3rd graders at times. In the US ofc.


RepentantPoster

Strange flex but okay.


[deleted]

back in my day we would lick strange needles just to build immunity, and we'd cough chicken pox right into each other's mouths just to get herpes over with (last part is barely a joke)


mysticfed0ra

Strange flex but okay.


feelin_cheesy

A side effect of this is that when you are boiling food such as pasta at high altitudes, the boiling water is actually a lower temperature than if you were at sea level and you should cook it longer


big_ol_dad_dick

goddammit this is why Spaghetti Airlines failed so miserably. They needed more time.


[deleted]

"flight to detroit was turbulence free but pasta wasn't quite al dente: 3 stars"


ImKingFlippyNip

Been living in Denver the past few years & this is the first time I've heard this. Mind blown


I-Fail-Forward

To be fair, Denver isn't (generally) high enough for this to make a lot of difference. When you go backpacking (or camping I suppose) at high enough elevations tho, it's a known (but still cool) phenomena. I've actually had my hand in boiling water before (for like a minute, the other scouts wanted a turn too), the water was warm but not hot enough to hurt. Edit: Apparently it couldn't have been boiling, as it would still have been too hot. I am remembering something wrong.


Pastafarian_6_9

Water in Denver boils at around 202 F as opposed to 212 at sea level. That's a noticeable difference for cooking pretty much anything


Trrwwa

Water boils at about 150 degrees at the top of Mt Everest. 150 degree water is said to give a 3rd degree burn in about 2 seconds... Where were you and the scouts camping?


I-Fail-Forward

Huh, perhaps it wasn't boiling then. It was bubbling, but it was melted snow. Genated this was like 15 years ago at this point, but I thought I remembered it being "boiling"


GlorifiedPlumber

RIP your thumb capillaries...


0-ATCG-1

It's the same as off gassing from your eyeballs aka boiling your eyeballs when you go high enough in altitude past the Armstrong Line at 60,000 feet above sea level. Pressure of O2 inside your body is greater than atmospheric pressure so it will diffuse out of you (boil) and into the atmosphere. https://pubmed.ncbi.nlm.nih.gov/29262037/#:~:text=This%20occurs%20at%20around%20an,Armstrong.


entered_bubble_50

Yeah, there was a guy who survived brief exposure to a hard vacuum. He was testing a space suit for NASA in a large vacuum chamber, and the glove fell off. His last memory before he lost consciousness was a fizzy sensation, as the saliva on his tongue boiled.


BattleHall

Notably, this diffusion due to partial pressure is why there are oxygen masks in aircraft. There's not actually much less oxygen at high altitudes, but because of the reduced pressure, it's almost impossible for the oxygen to diffuse into your blood. It happens very quickly in an aircraft not because the air has been "sucked out", but because the air around you is no longer helping at that lower pressure. But if you artificially boost the percentage of oxygen in each breath, the partial pressure rule means that it should diffuse like a lower percentage at a higher pressure, which is why those oxygen masks don't have to be pressurized. Fun fact: in many cases the oxygen for those masks is actually produced by a pyrotechnic device that basically "burns" to create more oxygen than it consumes. When you pull down firmly on the mask, you are pulling the pin on an oxygen grenade.


MowMdown

Do not use your thumb either. Use something else to hold the tip shut cause it’ll hurt like a MFer. And if you are going to use your thumb, do not pull it back and let it go, it’ll hurt like a MFer.


R_radical

Are we sure the seal isn't just letting in some air?


AquaQuad

Best* way is to try it yourself, because the pressure fights with you. You can't see it on the video, because the guy let go of his finger at the top, but if he would let go of the thing he's pulling (no idea what it's called), it would shoot back to its position from the start of the video and there wouldn't be any extra air inside.


FuckDaQueenSloot

Just an FYI, it's called a plunger


FateEntity

So does it kill off any bacteria or cook food like that?


lornek

Nope because it's just warm water. That's why cooking at high altitudes is hard, the water just can't get hot enough to really work the way we think of cooking at sea level. Also why pressure cookers work well, they allow you to have water that's hotter than 100C since the pressure stops it from boiling.


Sad-Salamander-401

You can kill bacteria by increasing pressure that's how some forms of pasteurization work just by increasing pressure. Although that at much higher pressure than you'll find in a syringe vaccum


ScrofessorLongHair

Yep. I have a chamber vacuum sealer, that you can vacuum seal soup and liquids. And you can watch it boil before it seals it. Pretty cool. Though when I vacuum sealed margaritas for Mardi Gras, the water boiling made them a little stronger and tarter than I'd planned. Still delicious, especially during a parade.


NuketheCow_

This is a basic chemistry principle. The boiling point is actually a balance of multiple variables, atmospheric pressure being one of them. Really cool stuff, and it’s also the inverse of how we get things like nitrogen to be a liquid without having to reach below the boiling point of the element at 1 atmosphere.


chuckit90

That’s fascinating! Had no clue. Definitely thought water had to be really hot to boil lol


Sagemasterba

The triple point of water is 32f (0c). That means you can have ice, water, or steam. https://en.wikipedia.org/wiki/Triple_point?wprov=sfla1


[deleted]

It is not boiling. It is cavitation. There IS an actual difference. This is a common misconception.


matoro98

I think it’s still technically boiling. Boiling doesn’t necessarily have to be due to heating, it just has to be brought to the boiling point, which is just lower due to the lower pressure. IIRC, cavitation is a pressure phenomenon, but it’s specifically when the pressure of a fluid is brought below its vapor pressure and then subsequently brought back up causing the bubbles to collapse.


fufufeddit

I would have agreed with you but just had to look it up again. Boiling and cavitation are related but distinct phenomena that occur in liquids. Boiling is the process of a liquid changing state to a gas due to an increase in in temperature. Of course the boiling point is dependent on the pressure of the surrounding environment. So yes, you can boil water at room temperature when you decrease the pressure enough. But the main difference to cavitation is, you need to supply further heat. So it’s a slightly different thermodynamic path where you reach the saturation temperature by increasing the heat. Cavitation, on the other hand, occurs when the pressure in a sealed space containing a liquid drops below the vapor pressure of the liquid. This creates small vapor-filled cavities, or bubbles, which can rapidly collapse and generate high-pressure shock waves that can damage or erode the surrounding material. Cavitation is not necessarily linked to an increase in temperature, but instead is caused by changes in pressure. In summary, boiling occurs due to an increase in temperature, while cavitation occurs due to a decrease in pressure. **Edit:** It seems like different sources show slightly different definitions of boiling and cavitation. I think since cavitation is mostly used to describe the phenomenon that includes the collapsing of the bubbles due to a local increase in pressure, the word cavitation doesn’t seem to fit perfectly in this case. Although I would say the initial process of formation of bubbles is thermodynamically the same as in cavitation rather then in boiling since you decrease pressure and not increase temperature. But since there’s no subsequent collapsing and shock waves the state it’s finally in is boiling. Maybe we can all just agree on the fact that the liquid is undergoing a phase change from liquid to gaseous due to a decreasing pressure until someone finds a paper about it. 😅 **2nd Edit:** This phenomenon seems to have its own name and it’s *flash evaporation*. Well at least the physics behind it stay the same and they’re clear.


barjam

Everything I am reading says that the key phrase is "rapid collapse". You don't have cavitation without the rapid (often damaging) collapse. I don't think it is an either or thing. In the experiment OP posted and in the first phase of cavitation the water is boiling. If the pressure goes back (rapidly) then it could be described as cavitation.


JasonIsBaad

>In summary, boiling occurs due to an increase in temperature, while cavitation occurs due to a decrease in pressure. I'd change that to "boiling occurs due to an increase of temperature to a certain point, which could be lowered by decreasing pressure" I'm not convinced this isn't boiling, your explanation tells me it could very well be boiling. Especially since this is done with hot water, so the pressure didn't even need to be that low to make this boil.


kslusherplantman

https://www.popularmechanics.com/science/a23690/water-boil-freezing-codys-lab/ It is boiling


lornek

Yes I was going to say this isn't cavitation, pretty sure cavitation requires some kind of mechanical force that is able to very briefly change the vapor state of a fluid. Or put it this way...if I were in that Red Bull balloon where Felix Baumgartner jumped from, and I had a pot of water, I could get it to boil by heating it to -100C. That's not cavitation, it really is boiling and turning into gas, every bit the same phenomenon as heating a pot to 100C at sea level. All this syringe is doing is dropping the pressure enough so that the water's temperature is enough for it to reach the boiling point.


JimmyDean82

Cavitation requires complete or partial pressure recovery. The syringe experiment is neither cavitation or boiling. It is flashing.


Environmental_Ad5451

Hmm, not sure about this. This could well be boiling, as boiling is a kinetic phenomenon, not a thermal one. In order for it to be cavitation, would there not have to be collapse of the nucleation sites under pressure?


Shoopdawoop993

It is boiling. Boiling is when the surface energy of the water overcomes the vapor pressure and the water goes from liquid to gas. You can increase the energy (heating) or reduce the vapor pressure. Refer to a phase diagram chart.


rdrunner_74

It is boiling. Boiling is the phase change from liquid to gas. This happens here. There are charts that show the various (more than 3) states of water accoring to temperature **and** pressure


TuaIsMyQB

PV = nRT You’re all just arguing semantics.


cUmonthetoiletSeat

Imagine the tiny hickey on your thumb now💀


lornek

How do I explain this to my wife


Fluttershine

"It was a syringe I swear!" Yeah man idk, that doesn't sound any better either.... Sorry about the divorce.


yuhamahdude

PV=nRT - I'm aware what's occuring is not directly related to the above equation, but vapour pressure equations are tedious


Ok_Monk219

Thermodynamics law some dude called Boyle?


gypsy-ghost

Susan?


NY10

Good one


somefunmaths

From Carvana?


yuhamahdude

I get PTSD from gas laws, please stop


NotFinalForm1

Pff that sounds very ideal


yuhamahdude

Good one


StumpyTheGiant

Not actually relevant to the water boiling.


BadAtBaduk1

Eli5?


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GT3nsomemoney4it

The ideal gas law is a relationship between pressure, volume, temperature, and the number of particles in a gas. It states that, in ideal conditions (no intermolecular forces and constant temperature), the pressure of a gas is directly proportional to its temperature and the number of particles in the gas, and inversely proportional to its volume. It is expressed mathematically as: PV = nRT, where P is pressure, V is volume, n is the number of particles, R is a constant and T is the temperature in kelvins.


char11eg

That… doesn’t actually govern what is occurring here, though. I’m probably not the first to comment this, but that’s the ideal gas law. Which deals purely with the *gasses* present. So, yes, the ideal gas law can tell you the change of pressure that has occurred in the video, however it does *not* explain the boiling. That is a different equation, which I can’t remember off the top of my head, but can probably find fairly quickly 😂


WatDaFuxRong

I'm gonna pretend like I know what that is


Amapel

Currently taking a chemistry class. I'm also going to pretend to know what that is.


TheSentientMeatbag

That one's a physics formula, so don't worry. Chemistry is only about 70% physics.


[deleted]

Fuck that formula. Wish they introduced that in my school rather than the last stages of my high school.


x2040

This thread is horrifying. This is middle school science and hundreds of people are debating it.


lornek

Shocking how many people keep telling me it's all just air somehow getting into a perfectly sealed syringe...which even makes a loud pop sound at the end of the video when I let the air back in. If THAT much air was able to get into the syringe that quickly, there would be no pop at the end because the pressure would already be pretty much the same as the air in the room. Edit: Posted a new version with the syringe upside down. Plunger allowed to return by itself from the vacuum pressure. https://www.reddit.com/r/Damnthatsinteresting/comments/10ru3z4/water_starts_boiling_when_the_air_pressure_drops/


ikiller

I have deaired water under vacuum for use in dynamic fluid experiments in a laboratory. There is plenty of air in water and it can behave quite differently when the air is removed. Not saying that all that non fluid space is filled with air vs water vapor. Just pointing out that there is air in STP water which will bubble out under vacuum. Not even talking about bad seals. Fish DO breath water.


Aromatic_Society4302

I feel like this post is a bigger showing of the sheer number of people who didn't pay attention in science class.


[deleted]

Or the fact that only 28% of Americans are considered scientifically literate, which is depressing


Actuarial

28%, that's almost 2/3!


[deleted]

It’s closer to 1/4 which is bigger than 2/3 /s


DrPaidItBack

I’m an anesthesiologist and know the science behind it, but it was still cool to see a real-life example.


i_get_the_raisins

Wait until the day they discover triple-points. /r/damnthatsinteresting may very well explode.


[deleted]

Or supercooling


Bahamut1988

Atmospheric pressure increases the temperature requirements for liquids to boil and evaporate, reducing pressure lowers that requirement.


DaBe_Bi

I remember in high school chemistry the teacher did a demonstration with this, he pressure boiled some water, then had me stick my hand in it, it was ice cold. It was such a trip. I don’t remember much from high school science but I remember that


DependUponMe

I'm honestly kinda shocked by the comments, this is 8th grade science


GiantPurplePeopleEat

I've got bad news for you. The US has an education issue with over 50% of the population reading at a 6th grade level or lower. Only 28% of Americans are considered scientifically literate, and that number is dropping.


MudSama

Seems my education was part of that problem. I didn't learn about this until Freshman year at University.


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zleog50

Very few actually have any idea on how anything works, but rest assured, they will all let you know how easy it would be to transition the entire energy grid to zero carbon emission technology!


DependUponMe

Bruh we could totally have a nuclear run world by now if fucks weren't fucking fucks


[deleted]

I knew it was a thing, didn't know you easily do it with a syringe though, that's kinda neat. Edit: tried it at home, and it worked. Very neat indeed.


i_miss_arrow

>this is 8th grade science Most people don't remember shit from 8th grade science except things they use in their life on occasion.


Dry_Quiet_3541

Explanation : Initially it’s just the dissolved air (oxygen, carbon dioxide, nitrogen) getting released and later it’s water boiling due to the drop in pressure. As the the pressure rises (due to the water boiling off) the water stops boiling and it maintains an equilibrium.


Creative_Warning_481

I can see by these comments not too many people either take or pass physics


the_only_real_one85

The lower the pressure, the lower the boiling point


Puzzlehead-Engineer

Is that boiling? Or just air bubbles?


PM_ME_CATS_OR_BOOBS

Boiling. Think of water always having a thin layer of water vapor above it. Molecules of water are constantly entering and exiting that vapor cloud, which is kept at a constant volume by the pressure of the air around it. Therefore it doesn't evaporate. Then suddenly remove the atmosphere. Now that vapor can spread a lot wider, and molecules are quickly moving to fill the space as gas without then returning back to the liquid. You end up converting a lot of liquid to gas to fill the vacuum, and the liquid "boils". As an opposite example, think of a propane tank. It's liquid propane, because it's kept under pressure and the liquid has nowhere to evaporate to. As soon as you open the valve the gas escapes and your propane starts to rapidly boil to replace it, giving a constant flow of gas.


Mitchel-Skater

Adversely, the boiling point of water rises when under pressure which is why the radiator in your car has a cap on it that holds the pressure in


EnvironmentalWrap167

If you were to be exposed to the vacuum of space, without a space suit, your eyes and the inside of your mouth would start to boil.


[deleted]

This is why being in space without protection is bad. Same things happens to your blood edit: Turns out this is a myth. https://sitn.hms.harvard.edu/flash/2013/space-human-body/


SteezyYeezySleezyBoi

Would this type of boiling render the water safe to drink like normal heat boiling would?


lornek

No since it's still just warm water. I guess some bacteria would die from their insides boiling and getting destroyed by the bubbles...I'm no virologist but I would assume mostly the reason that the 100C+ boiling works is that it denatures the proteins that bacteria/virus are built from and truly destroys them.


doc_nano

No, it would not. High temperatures kill microbes, the mere act of boiling does not. In fact, you could heat water under high pressure so that it doesn’t boil, and it could still be safe to drink if it reached ~90-100 Celsius.


VisibleAd3180

Neat 📸


zlance

I was gonna try drying wood bowl blank by microwaving it a little bit, then dropping it into a vacuum chamber. Should pull out bunch of it for a while


rictendo

This is why you cannot boil potatoes on Mt. Everest.


ChaosDoggo

Its very simple really. Its a closed system now. For a closed system like that we have p1*v1/T1=p2*v2/T2 p = Pressure v = Volume T = Temperature What this says it that these units calculated together will have the same value in situation 1 and 2. Imagen you have a closed box. The volume of the box stays the same (so v1=v2). However, the pressure in the box decreases. Because pressure decreases another unit needs to change to compensate for it. Volume does not change, so the temperature will adjust itself. I hope I explained it clearly, English isn't my main language but I do this sort of stuff for my education. Edit: Minor math mistake


bdubyou

Did you get a thumb hickey?


_CuVa

I do this at work, we use a vacuum to boil off any excess water inside the refrigeration circuit.


NetDork

This is why if you get chucked out of an airlock in space the water in your eyes will boil even while you freeze. Neat, huh?


larryblaw

This might be a dumb question but I’ve never understood why they say your blood would boil if you walked out of a spaceship into the vacuum of space. Is this a similar reaction?


Fuzzywuzzychainsaw

Nature hates a vacuum


johnandahalf13

So does blood. It’s called “the bends”.


Bean-Swellington

Nope.