Using 26.016 as the molecular
weight of the gas (O = 16), 1 litre of dry acetylene at 0 deg. C. and 760 mm.
weighs 1.16963 grammes, or 1 gramme measures 0.854973 litre. From this it
follows that the theoretical specific gravity of the gas at 0 deg./0 deg. C.
is 0.9039 (air = 1), a figure which may be compared with Leduc's
experimental value of 0.9056. Taking as the coefficient of expansion at
constant pressure the figure already given, viz., 0.003738, the weights
and measures of dry and moist acetylene observed under British conditions
(60 deg. F. and 30 inches of mercury) become approximately:
Dry. Saturated.
1 litre . . . 1.108 grm. . . 1.102 grm.
1 gramme . . . 0.902 litre. . . 0.907 litre.
1000 cubic feet . 69.18 lb. . . . 68.83 lb.
It should be remembered that unless the gas has been passed through a
chemical drier, it is always saturated with aqueous vapour, the amount of
water present being governed by the temperature and pressure. The 1 litre
of moist acetylene which weighs 1.102 gramme at 60 deg. F. and 30 inches of
mercury, contains 0.013 gramme of water vapour; and therefore the weight
of dry acetylene in the 1 litre of moist gas is 1.
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