Internal Energy Revisited

Do not confuse



internal energy


Internal Energy

The total energy of the molecules within a system. This includes vibrational, rotational and translational energies. These forms of internal energy are sometimes called "sensible" because they change when the temperature changes. But, internal energy also includes the energies of molecular interactions, chemical bonds and nuclear energies.
Heat exchange arrow

Cup of
hot tea

System boundary
2 kJ
Surrounding Air
2 kJ
Cup of water.
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Ch 4, Lesson B, Page 2 - Internal Energy Revisited