,
and
C_p = 1.26 C_v.
From this it follows that C_p, _i.e._, the specific heat at constant
pressure of acetylene, should be 0.373.] It will be seen that this value
for _k_ differs considerably from the corresponding ratio in the
case of air and many common gases, where it is usually 1.41; the figure
approaches more closely that given for nitrous oxide. For the specific
heat of calcium carbide Carlson quotes the following figures:
0 deg. 1000 deg. 1500 deg. 2000 deg. 2500 deg. 3000 deg. 3500 deg.
0.247 0.271 0.296 0.325 0.344 0.363 0.381
The molecular volume of acetylene is 0.8132 (oxygen = 1).
According to the international atomic weights adopted in 1908, the
molecular weight of acetylene is 26.016 if O = 16; in round numbers, as
ordinarily used, it is 26. Employing the latest data for the weight of 1
litre of dry hydrogen and of dry normal air containing 0.04 per cent. of
carbon dioxide at a temperature of 0 deg. C. and a barometric pressure of
760 mm. in the latitude of London, viz., 0.089916 and 1.29395 grammes
respectively (Castell-Evans), it now becomes possible to give the weight
of a known volume of dry or moist acetylene as measured under stated
conditions with some degree of accuracy.
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