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Jim,
The rest of the situation is illuminated!
which has already been mentioned in this thread. A heavy cylinder is
filled with a mixture of gasoline and air sealed and insulated. In the
side is a spark plug to which we can apply a spark whose energy
contribution may be considered negligible. The temperature goes up when
the plug sparks; the pressure increases;
but no heat is transfered,
no work is done,
and there is no change in internal energy.
In order to
understand how this can be we have to include all of the energy in the
internal energy.