; carbon monoxide, moist 664 deg., dry 692 deg.; ethylene,
in oxygen 510 deg., in air 543 deg.; and methane, in oxygen between 550 deg.
and 700 deg., and in air, between 650 deg. and 750 deg. C.
Numerous experiments have been performed to determine the temperature of the
acetylene flame. According to an exhaustive research by L. Nichols, when the
gas burns in air it attains a maximum temperature of 1900 deg. C. +- 20 deg.,
which is 120 deg. higher than the temperature he found by a similar method
of observation for the coal-gas flame (fish-tail burner). Le Chatelier had
previously assigned to the acetylene flame a temperature between 2100 deg.
and 2400 deg., while Lewes had found for the dark zone 459 deg., for the
luminous zone 1410 deg., and for the tip 1517 deg. C, Fery and Mahler have
also made measurements of the temperatures afforded by acetylene and other
fuels, some of their results being quoted below. Fery employed his optical
method of estimating the temperature, Mahler a process devised by Mallard
and Le Chatelier. Mahler's figures all relate to flames supplied with air
at a temperature of 0 deg. C. and a constant pressure of 760 mm.
Hydrogen .
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