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working substance

The definition of a working substance is the liquid, air or gas that makes an engine run.

(noun)

An example of a working substance is oil that helps to make the pistons move.

See working substance in Webster's New World College Dictionary

the air, gas, or liquid that works the pistons, vanes, etc. of an engine

See working substance in American Heritage Dictionary 4

noun

A substance, such as a fluid, used to effect a thermodynamic or other change in a system.

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