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)
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“Working substance.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/working%20substance. Accessed 21 May. 2022.
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Time Traveler for working substance
The first known use of working substance was in 1855
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