Jump to content

How dose osmosis work


Recommended Posts

This docent make sense to me. Lets say that you had a tub of salt water it the middle of the tub there's a divider. On one side of the tub theirs more salt than the other. If you remove the divider the salt would move around until there's the same amount of salt everywhere. Why is this. Why dose hot air rises i know its less dense because heat expands but how dose that have anything to do with it rising. Dose it weigh less because its less dense than cold air.

Link to post
Share on other sites

This docent make sense to me. Lets say that you had a tub of salt water it the middle of the tub there's a divider. On one side of the tub theirs more salt than the other. If you remove the divider the salt would move around until there's the same amount of salt everywhere. Why is this.

 

That isn't osmosis, but diffusion. It happens because all the molecules (water and salt) are moving around at random. So after some time, it all averages out. Put a drop of ink in a glass of water and watch it slowly spread out until it disappears. Same thing.

 

Why dose hot air rises i know its less dense because heat expands but how dose that have anything to do with it rising. Dose it weigh less because its less dense than cold air.

 

Yes, because it weighs less. (That is what "less dense" means, effectively). It is like oil on water: the oil is less dense and so it floats.

Link to post
Share on other sites

The underlying concept here is energy; systems tend toward their lowest energy state.

...and systems also tend towards their highest entropy state.

 

Diffusion is a good example of that, it seems to me.

 

~

Edited by Essay
Link to post
Share on other sites

 

Sorry, I'm not sure of your point — what about KE of individual molecules?

It's the kinetic energy of the random motion of the water molecules,because there are more water molecules in the low concentrate side of the membrane than on the high side,the sum of the kinetic energy is greater on the low side.

Link to post
Share on other sites

Hot air rises above cold air because it is less dense. The particles in the warmer air have more random kinetic energy than those of the cooler air, so they spread out more(kind of like diffusion, explained above). Less dense means that there are less air molecules per cubic unit of space.

Link to post
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
×
×
  • Create New...

Important Information

We have placed cookies on your device to help make this website better. You can adjust your cookie settings, otherwise we'll assume you're okay to continue.