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Let us examine the therm "thermal energy". This term is not in my
dictionary, nor should it be in that of any physics teacher. It is
a source of confusion .... and a barrier to conceptual grasp.
The change in thermal energy of a system is a sum of the heat that
flows into it and that part of the work that is done on it that does
not appear as a change in the kinetic energy of the center of mass
of the system.