Question

Why do warm gases/liquids rise and cool gases/liquids fall?

Answer 1

This is a manifestation of `"Archimedes' Principle......"`

Explanation:

And is also the reason why solids and liquids that are less dense than water, FLOAT on water.......

`"Archimedes' Principle states that......"`

`"...a body immersed in a fluid experiences a buoyant force equal"` `"to the weight of the fluid it displaces........."`

A gas or a liquid (a fluid in fact) that is WARM necessarily occupies more volume than a colder fluid. This is especially true for gases, where volume is a state function of temperature......`VpropT`.

And this is also the basis of the hot-air balloon, where the hot gas inside the balloon displaces a mass of air that is greater than the mass of balloon and the basket, and so the balloon floats.