# Thermal Energy

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Thermal energy is the energy of an object due to random motions of its atoms and molecules. The hotter the object, the greater its thermal energy. Thermal energy is an extensive variable, proportional to the size of the object. The individual molecules can have different kinetic energies, but a hot object has a higher average value. In a gas or a liquid, molecules can move freely in all directions; in a solid, molecules execute small vibrations in all directions about fixed positions.

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Contributed by: Enrique Zeleny (March 2011)

Based on a package by: Harry Calkins

Open content licensed under CC BY-NC-SA

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"Thermal Energy"

http://demonstrations.wolfram.com/ThermalEnergy/

Wolfram Demonstrations Project

Published: March 7 2011