a substance, usually a fluid, that undergoes changes in pressure, temperature, volume, or form as part of a process for accomplishing work.
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What does “clement” mean?
Origin of working substance
First recorded in 1895–1900
Words nearby working substance
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020
British Dictionary definitions for working substance
the fluid, esp water, steam, or compressed air, that operates an engine, refrigerator, etc