Why Does Hot Water Rise?

Answer

Hot water rises because it is less dense as compared to cold water. Heating the water increases its temperature but decreases its density, the less dense hot water thus rises as the cold water sinks to occupy the space.
Q&A Related to "Why Does Hot Water Rise?"
hot water rises because the air bubbles produced by heating the water lower the density of the water, therefore causing it to be lighter than the unheated water.
http://wiki.answers.com/Q/Why_do_hot_water_rise
The molecules of a fluid are free to move. Liquid molecules, constrained by electrostatic and electrodynamic forces, do what's called "Brownian motion" gas molecules move
http://www.quora.com/Why-does-a-hot-fluid-rise
As hot air from the earth's surface rises, it soon becomes cold air as it nears space, according to Historyforkids.org. As hot air cools it sinks back to the surface of the earth,
http://www.ehow.com/about_6384427_hot-rise-cold-ai...
The top of water freezes first because that is where it is
http://www.chacha.com/question/why-does-the-top-of...
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