4 atmospheres
when the spark was applied to the acetone. When the vessel was filled 56
per cent. full, the pressures after explosion reached about 89, or 155
atmospheres, according as the gas or the liquid was treated with the
spark. But when the original pressure was 20 atmospheres, and the vessel
was filled to 35 per cent. of its actual capacity with solution, the
final pressures ranged from 303 to 568 atmospheres when the gas was
fired, and from 2000 to 5100 when the spark was applied to the acetone.
Examining these figures carefully, it will be seen that the phenomena
accompanying the explosion of a solution of acetylene in acetone resemble
those of the explosion of compressed gaseous acetylene when the original
pressure under which the solution is stored is about 10 atmospheres; but
resemble those of the explosion of liquefied acetylene when the original
pressure of the solution reaches 20 atmospheres, this being due to the
fact that at an original pressure of 10 atmospheres the acetone itself
does not explode, but, being exothermic, rather tends to decrease the
severity of the explosion; whereas at an original pressure of 20
atmospheres the acetone does explode (or burn), and adds its heat of
combustion to the heat evolved by the acetylene.
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