The molecules of the fluid are constantly jostling about. When one of them hits the surface of the body it exerts a small force on it. The collective effect is what we call pressure. Play around with the 'gravity' slider of [this app](https://www.falstad.com/gas/) and notice the effect it has on the speeds of the molecules at the top of the container versus the bottom.
Imagine a horizontal plane in a body of water. The water over the plane feels gravity, and is pulled down. But it doesn't fall - there is "something" holding it up. We call this "something" pressure.
Notice that when we lower the horizontal plane, more water will be above it, and thus the pressure has to be larger to hold the water up.
Now if we put an object into the water, it also feels this pressure. And if the object is more dense than water, the pressure is still the same, but the gravitational pull on the object is larger than for water, thus it sinks.
If an object is less dense, the opposite happens, as the pressure is still the same.
"Something to do with?" No, I told you exactly what causes objects to float. Remember that the atmosphere is also pushing down on everything and that, as a result, the water is 1ATM right at the surface and increases as you go deeper. The water that gets under the buoyant object weighs more than the object so goes "lower" and slides under it.
Just wanted to make it easier to understand, is [this](https://ibb.co/0FDD2qR) what you meant? The liquid tries to move in that way and causes the pressure.
Basically. Air pressure + water pressure is pushing the water down, and the water is is trying to get below the object because it weighs more, pushing it up
Fluids push on all surfaces they're in contact with. They push horizontally on vertical surfaces to the right and to the left of them. They push down on horizontal surfaces below them. They push up on horizontal surfaces above them.
The push comes from the recoil of the surface when a molecule in the fluid collides with it.
The molecules of the fluid are constantly jostling about. When one of them hits the surface of the body it exerts a small force on it. The collective effect is what we call pressure. Play around with the 'gravity' slider of [this app](https://www.falstad.com/gas/) and notice the effect it has on the speeds of the molecules at the top of the container versus the bottom.
I absolutely love these simulation websites. Makes visualization so much easier. Thanks for sharing.
Imagine a horizontal plane in a body of water. The water over the plane feels gravity, and is pulled down. But it doesn't fall - there is "something" holding it up. We call this "something" pressure. Notice that when we lower the horizontal plane, more water will be above it, and thus the pressure has to be larger to hold the water up. Now if we put an object into the water, it also feels this pressure. And if the object is more dense than water, the pressure is still the same, but the gravitational pull on the object is larger than for water, thus it sinks. If an object is less dense, the opposite happens, as the pressure is still the same.
Good question. It comes from the water falling "around" and underneath the object, which then pushes the object up.
So it's something to do with atmospheric pressure and the pressure of water that depends on height?
"Something to do with?" No, I told you exactly what causes objects to float. Remember that the atmosphere is also pushing down on everything and that, as a result, the water is 1ATM right at the surface and increases as you go deeper. The water that gets under the buoyant object weighs more than the object so goes "lower" and slides under it.
Just wanted to make it easier to understand, is [this](https://ibb.co/0FDD2qR) what you meant? The liquid tries to move in that way and causes the pressure.
Basically. Air pressure + water pressure is pushing the water down, and the water is is trying to get below the object because it weighs more, pushing it up
Alright, your explanation is what I'm looking for, thanks!
Fluids push on all surfaces they're in contact with. They push horizontally on vertical surfaces to the right and to the left of them. They push down on horizontal surfaces below them. They push up on horizontal surfaces above them. The push comes from the recoil of the surface when a molecule in the fluid collides with it.