18 atmosphere, in (_b_)
O.33 atmosphere, and in (_c_) 0.46 atmosphere per 1 deg. Centigrade
within the temperature limits quoted. Taking case (_b_) as the
normal, it follows that the increment in pressure per 1 deg. C. is 1/37
(usually quoted as 1/30); so that, measured as a proportion of the
existing pressure, the pressure in a closed vessel containing a solution
of acetylene in acetone increases nearly as much (though distinctly less)
for a given rise in temperature as does the pressure in a similar vessel
filled with liquefied acetylene, but the absolute increase is roughly
only one-third with the solution as with the liquid, because the initial
pressure under which the solution is stored is only one-half, or less,
that at which the liquefied gas must exist.
Supposing, now, that acetylene contained in a closed vessel, either as
compressed gas, as a solution in acetone, or as a liquid, were brought to
explosion by spark or shock, the effects capable of production have to be
considered. Berthelot and Vieille have shown that if gaseous acetylene is
stored at a pressure of 11.23 kilogrammes per square centimetre,
[Footnote: 1 kilo. per sq. cm. is almost identical with 1 atmosphere, or
15 lb.
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