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Words *do* matter. Of course, one can use *any* word for anything, but............................................................................
the object is to be understood not to argue over the word. But if the same
word is used for multiple things, understanding is hampered - if not
destroyed. For example, if the word "heat" is used for what is *inside* of
a system *and* for what is done to the system, no one will understand.
This term is not in my lexicon, nor should it be in that of any physics
teacher. It is a source of confusion and ... a barrier to conceptual grasp.
If you will define the term as a function of the parameters which describe
the state of the system ... I will then be able to discuss .... Note that
I am not asking for a semantic clarification here; I am asking for a
physical relation.
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.