, and 39.76 at 19.5 deg. C. (Willson and Suckert); or 26.5 at 0 deg. C.,
and 42.8 at 20.0 deg. C. (Villard). Averaging those results, it may be said
that the tension rises from 23.2 atmospheres at 0 deg. C. to 40.77 at 20 deg.
C., which is an increment of 1/26 or 0.88 atmosphere, per 1 deg. Centigrade;
while, of course, liquefied acetylene cannot be kept at all at a temperature
of 0 deg. unless the pressure is 21 atmospheres or upwards. The solution of
acetylene in acetone can be stored at any pressure above or below that of
the atmosphere, and the extent to which the pressure will rise as the
temperature increases depends on the original pressure. Berthelot and
Vieille have shown that when (_a_) 301 grammes of acetone are
charged with 69 grammes of acetylene, a pressure of 6.74 atmospheres at
14.0 deg. C. rises to 10.55 atmospheres at 35.7 deg. C.; (_b_) 315 grammes
of acetone are charged with 118 grammes of acetylene, a pressure of 12.25
atmospheres at 14.0 deg. C. rises to 19.46 at 36.0 deg. C.; (_c_) 315
grammes of acetone are charged with 203 grammes of acetylene, a pressure
of 19.98 atmospheres at 13.0 deg. C. rises to 30.49 at 36.0 deg. C.
Therefore in (_a_) the increase in pressure is 0.
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