(-268.7° C.), the density of the liquid 0.154, the critical temperature 5° abs., and the critical pressure 2.3 atmospheres (Communications from the Physical Laboratory at Leiden, No.
Assuming that the whole of the energy was converted into heat, when the air was subjected to a pressure of 21.5 atmospheres Joule obtained for the mechanical equivalent of heat about 824.8 foot-pounds, and when a pressure of only 10 .
5 atmospheres was employed the result was 796.9 foot-pounds.
In allowing the air to expand from a pressure of 21 atmospheres to that of i atmosphere the value of the mechanical equivalent of heat obtained was 821.89 foot-pounds.
Between io atmospheres and 1 it was 815.875 foot-pounds, and between 23 and 14 atmospheres 761.74 foot-pounds.
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