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

From Textbooks • Aug. 12, 2015

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

They differ from it, however, in the fact that their working substance is not air, but a mixture of gases—a necessary consequence of internal combustion.

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

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

In any heat-engine it is essential that the working substance should be at a high temperature while it is taking in heat, and at a relatively low temperature when it is rejecting heat.

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