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Re: Definitions



In taking this to extended bodies and moving to the first law there
are a number of developments. In place of a particle we deal with a
system, which must be carefully defined; the concept of work (W) will
cover only the mechanical ways of changing the total energy of the
system; non-mechanical ways are called heat (Q);

Heating a system IS mechanical!!!


the total energy of
the system (E ) or (U) will comprise not only the kinetic and various
potential energies of the body but other energies which can be labeled
thermal, chemical, etc. The law is written as W + Q = delta U.

with the first law, which then tells you that the system has lost some
kinetic energy and there has been a heat transfer to the surroundings
(which, in the fullness of time, happens).

There is no such thing a "heat transfer" -- "heat" does not move -- "heat"
is a form of work and is _done_ on or by a system.

You didn't really think, did you, that you would get away with saying
things like you have and then not have this continuing discussion.

There are other problems as well.

Jim Green
mailto:JMGreen@sisna.com
http://users.sisna.com/jmgreen