<P> From the standpoint of statistical mechanics , the internal energy is equal to the ensemble average of the sum of the microscopic kinetic and potential energies of the system . </P>
<P> From the standpoint of statistical mechanics , the internal energy is equal to the ensemble average of the sum of the microscopic kinetic and potential energies of the system . </P>
the sum of the kinetic and potential energies of all particles in the system is called the
the sum of the kinetic and potential energies of all particles in the system is called the
internal energy
internal energy