Thermal Physics

Thermal Energy

What is thermal energy?

Thermal energy is the random kinetic energy of the moving atoms and molecules that make up matter. But objects expand when heated, so the bonds holding the atoms together stretch. That means they have more elastic energy. So thermal energy is the sum of the kinetic and elastic energy of the atoms and molecules, and the bonds that hold them together. It is energy that is inside the object, and so it is called a form of internal energy.


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