Question

why hot water is denser than cold water?

Answer 1

hot water is less dense and float on room temperature but the cold water is much denser to be sink in room temperature..

Answer 2

cooling a substance causes molecules to slow causes molecules to slow down and get slighty closer together occupying a smaller volume that result in an increase density . Hot water is less dense and will float on room temperature water . cold water is more dense and will sink in room temperature water