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

This fraction is independent of the nature of the working substance, but varies with the temperature, and is121 therefore a function of the temperature.

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

One of the chief practical objections to air-engines is the great bulk of the working substance in relation to the amount of heat that is utilized in the working of the engine.

From The Project Gutenberg Encyclopedia Volume 1 of 28 by Project Gutenberg