Question

Why does hot water go up and cold water
go down?

Answer 1

Any object or substance that is less dense than a fluid will float in that fluid, so hot water rises (floats) in colder water. ... Any object or substance that is more dense than a fluid will sink in that fluid, so cold water sinks in warmer water. Hot air rises and cold air descends for exactly the same reason.

Answer 2

Explanation:

Any object or substance that is less dense than a fluid will float in that fluid, so hot water rises (floats) in colder water. ... Any object or substance that is more dense than a fluid will sink in that fluid, so cold water sinks in warmer water. Hot air rises and cold air descends for exactly the same reason.