working substance


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working substance

n.
A substance, such as a fluid, used to effect a thermodynamic or other change in a system.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

working substance

or

working fluid

n
(Mechanical Engineering) the fluid, esp water, steam, or compressed air, that operates an engine, refrigerator, etc
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
References in periodicals archive ?
The actor admitted he was a "very hard working substance abuser" when Cameron, 37 -- his son with ex-wife Diandra -- was growing up and he believes this along with "Cameron's own genetic issues, ADHD, and dyslexia", contributed to his incarceration for drug possession.
All these operations must be carried out with the maximal possible cargo of working substance. According the set of requirements defining the working fly of a plane for agricultural works, the design and construction of such plane represent considerable compromise.
The concept of discontinuous deformation in an elastomer can be used to design thermomechanical heat engines using an elastomer as the working substance, in a manner not utilized previously.