Working Fluid
The working fluid can be of any composition and the system may be single phase (liquid only or gas only) or dual phase (liquid/gas).
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Famous quotes containing the words working and/or fluid:
“I do not mind if I lose my soul for all eternity. If the kind of God exists Who would damn me for not working out a deal with Him, then that is unfortunate. I should not care to spend eternity in the company of such a person.”
—Mary McCarthy (1912–1989)
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—Oswald Spengler (1880–1936)