. . . . . 2568 deg. C.
" air at 500 deg. C . . . . 2780 deg. C.
" air at 1000 deg. C . . . . 3000 deg. C.
" oxygen . . . . . . 4160 deg. C.
EXPLOSIVE LIMITS.--The range of explosibility of mixtures of acetylene
and air has been determined by various observers. Eitner's figures for
the lower and upper explosive limits, when the mixture, at 62.6 deg. F.,
is in a tube 19 mm. in diameter, and contains 1.9 per cent. of aqueous
vapour, are 3.35 and 52.3 per cent. of acetylene (_cf._ Chapter X.).
In this case the mixture was fired by electric spark. In wider vessels,
the upper explosive limit, when the mixture was fired by a Bunsen flame,
was found to be as high as 75 per cent. of acetylene. Eitner also found
that when 13 of the 21 volumes of oxygen in air are displaced by carbon
dioxide, a mixture of such "carbon dioxide air" with acetylene is
inexplosive in all proportions. Also that when carbon dioxide is added to
a mixture of acetylene and air, an explosion no longer occurs when the
carbon dioxide amounts to 46 volumes or more to every 54 volumes of air,
whatever may be the proportion of acetylene in the mixture.
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