The other method consists in pumping acetylene
under pressure into a cylinder apparently quite full of some highly
porous solid matter, like charcoal, kieselguhr, unglazed brick, &c. This
has the practical result that the gas is held under a high state of
compression, or possibly as a liquid, in the minute crevices of the
material, which are almost of insensible magnitude; or it may be regarded
as stored in vessels whose diameter is less than that in which an
explosive wave can be propagated (_cf._ Chapter VI.).
DISSOLVED ACETYLENE.--According to Fouche, the simple solution of
acetylene in acetone has the same coefficient of expansion by heat as
that of pure acetone, viz., 0.0015; the corresponding coefficient of
liquefied acetylene is 0.007 (Fouche), or 0.00489 (Ansdell) _i.e._,
three or five times as much. The specific gravity of liquid acetylene is
0.420 at 16.4 deg. C. (Ansdell), or 0.528 at 20.6 deg. C. (Willson and
Suckert); while the density of acetylene dissolved in acetone is 0.71 at 15
deg. C. (Claude). The tension of liquefied acetylene is 21.53 atmospheres at
0 deg. C., and 39.76 atmospheres at 20.15 deg. C. (Ansdell); 21.53 at 0 deg.
C.
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