7.1. Introduction
In Joule's experiment, a quantity of compressed gas was allowed to expand into a vacuous space without doing external work. No change of temperature of the gas was detected after expansion. The consequence of this was
Thus at constant temperature, u is not a function of p and v. It must, therefore, be a function of T only.
The thermal capacity of the apparatus employed was very large in comparison with that of the gas experimented upon. To detect any thermal effect that might reasonably have been expected, a more delicate arrangement was necessary. Joule in collaboration with Thomson carried out extensive series of researches ...
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