351. The most portable form in which power can be condensed
is, perhaps, by the liquefaction of the gases. It is known that,
under considerable pressure, several of these become liquid at
ordinary temperatures; carbonic acid, for example, is reduced to
a liquid state by a pressure of sixty atmospheres. One of the
advantages attending the use of these fluids, would be that the
pressure exerted by them would remain constant until the last
drop of liquid had assumed the form of gas. If either of the
elements of common air should be found to be capable of reduction
to a liquid state before it unites into a corrosive fluid with
the other ingredient, then we shall possess a ready means of
conveying power in any quantity and to any distance. Hydrogen
probably will require the strongest compressing force to render
it liquid, and may, therefore, possibly be applied where still
greater condensation of power is wanted. In all these cases the
condensed gases may be looked upon as springs of enormous force,
which have been wound up by the exertion of power, and which will
deliver the whole of it back again when required.
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