What is meant by the internal energy of a body?

Difficulty: Easy

Internal energy:

              The sum of kinetic energy and potential energy associated with the atoms, molecules, and particles of a body is called internal energy.
              The internal energy of a body depends on many factors such as the mass of the body, kinetic and potential energy of molecules, etc.

                                    $\triangle U$ = Q – W

Where:     $\triangle U$ = internal energy,   Q = Heat and W = work done

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