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working substance

a substance, usually a fluid, that undergoes changes in pressure, temperature, volume, or form as part of a process for accomplishing work.
Origin of working substance
First recorded in 1895-1900 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2018.
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Examples from the Web for working substance
Historical Examples
  • We can obtain another important result for the case of the working substance in two phases from equation (B).

    Lord Kelvin Andrew Gray
British Dictionary definitions for working substance

working substance

the fluid, esp water, steam, or compressed air, that operates an engine, refrigerator, etc
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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