A working fluid is a pressurized gas or liquid that actuates a machine. Examples include steam in a steam engine, air in a hot air engine and hydraulic fluid in a hydraulic motor or hydraulic cylinder. More generally, in a thermodynamic system, the working fluid is a liquid or gas that absorbs or transmits energy.
Read more about Working Fluid: Properties and States, Work, Choice, Applications and Examples
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“A playwright ... is ... the litmus paper of the arts. He’s got to be, because if he isn’t working on the same wave length as the audience, no one would know what in hell he was talking about. He is a kind of psychic journalist, even when he’s great.”
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