Hence this density has to be taken into
consideration in the construction of burners, i.e., a burner required to
pass a gas of high density must have a larger orifice than one for a gas
of low density, if the rate of flow of gas is to be the same under the
same pressure. This, however, is a question for the burner manufacturers,
who already make special burners for gases of different densities, and it
need not trouble the consumer of acetylene, who should always use burners
devised for the consumption of that gas. But the Law of effusion
indicates that the volume of acetylene which can escape from a leaky
supply-pipe will be less than the volume of a gas of lower density,
_e.g._, coal-gas, if the pressure in the pipe is the same for both.
This implies that on an extensive distributing system, in which for
practical reasons leakage is not wholly avoidable, the loss of gas
through leakage will be less for acetylene than for coal-gas, given the
same distributing pressure. If _v_ = the loss of acetylene from a
distributing system and _v'_ = the loss of coal-gas from a similar
system worked at the same pressure, both losses being expressed in
volumes (cubic feet) per hour, and the coal-gas being assumed to have a
density of 0.
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