Quote:
Originally Posted by jakobnev
Well they can't store the energy in the liquid because liquids don't compress.
Conversly, gas doesn't work well as the working fluid in the motor/pump, precisely because it is compressible, and compression/expansion causes heating/cooling which in turn causes a great loss in efficiency.
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"Unlike a gas, a liquid may not always mix readily with another liquid, will not always fill every space in the container, forming its own surface,
and will not compress significantly, except under extremely high pressures."
from:
Liquid - Wikipedia, the free encyclopedia
But that answers my own question the pressure require is too great.