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 planetary roller systems feature modular construction where up to eight cylinder assemblies can be connected in a series; precise temperature control by means of a thermodynamic system; high cooling capacity of high viscose products due to extremely large surface exchange; an approximately fivefold larger surface compared with other compounding systems due to the process geometry; extremely high energy exchange at heating and cooling processes; a larger procedural window due to variations of the dosing by means of lateral feeding (side feeder); optimal degassing possibilities; and a high degree of dispersion at gentle compounding and low speed, according to the company.
Jacob Bekenstein on whether a black hole can radiate, but in the end the two physicists in the 1970s jointly developed the theory of Bekenstein-Hawking entropy -- a measure of the unavailable energy in a closed thermodynamic system which is also usually considered to be a measure of the system's disorder.
In addition to that, the mass parameter should be considered there as enthalpy of the system, which is useful to study the critical behaviour of the thermodynamic system. The BH equation of state could be used to study for comparisons with the classical thermodynamic equation of state (Van der-Waal equation).
In a classic thermodynamic system, heat flows from a hot body to a cold one.
Any irreversible process reflects a specific behavior of a thermodynamic system (Kondepudi and Prigogin, 2015).
Authors of the paper "Evaluation of Monocular Treatment for Meibomian Gland Dysfunction with an Automated Thermodynamic System in Elderly Chinese Patients: A Contralateral Eye Study" present a prospective, examiner-masked, contralateral eye clinical trial on the safety and efficacy of monocular treatment for elderly Chinese patients with meibomian gland dysfunction (MGD) with an automated thermodynamic system (LipiFLow).
Also, in a thermodynamic system, it is necessary to know about the pressure and temperature, etc.
English translation: On the Decrease of Entropy in a Thermodynamic System by the Intervention of Intelligent Beings.
A higher-level property of a thermodynamic system is the process of material delivery: a flow of material originates at a source, follows a path, and terminates at a sink.
(Unaware of nuclear energy, Adams predicted that the sun's core would burn out in a few thousand years.) But Earth is not a closed thermodynamic system - and the universe may not be either.