working substance

American  

noun

1. a substance, usually a fluid, that undergoes changes in pressure, temperature, volume, or form as part of a process for accomplishing work.

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working substance British  

noun

1. the fluid, esp water, steam, or compressed air, that operates an engine, refrigerator, etc

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Etymology

Origin of working substance

First recorded in 1895–1900

Example Sentences

Heat transfer Qh occurs into the working substance during the isothermal path AB, which takes place at constant temperature Th .

From Textbooks • Aug. 12, 2015

Heat transfer Qc occurs out of the working substance during the isothermal path CD, which takes place at constant temperature Tc .

From Textbooks • Aug. 12, 2015

Having established the general notions of a perfect cycle, he proceeds to give a more exact illustration, employing a gas as the working substance.

From Encyclopaedia Britannica, 11th Edition, Volume 13, Slice 2 "Hearing" to "Helmond" by Various

First we take the working substance of the engine as consisting of matter in two states or phases; for example, ice and water, or water and saturated steam.

From Lord Kelvin An account of his scientific life and work by Gray, Andrew

The air has served as working substance in a heat-engine; it has also been employed in the most advantageous manner possible, since no useless re-establishment of the equilibrium of heat has been allowed to occur.

From Encyclopaedia Britannica, 11th Edition, Volume 13, Slice 2 "Hearing" to "Helmond" by Various