working substance

noun

Definition of working substance

: a usually fluid substance that through changes of temperature, volume, and pressure is the means of carrying out thermodynamic processes or cycles (as in a heat engine)

First Known Use of working substance

1855, in the meaning defined above

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The first known use of working substance was in 1855

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Cite this Entry

“Working substance.” The Merriam-Webster.com Dictionary, Merriam-Webster Inc., https://www.merriam-webster.com/dictionary/working%20substance. Accessed 16 December 2019.

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