SINCE 1828
working substance
nounDefinition 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)
Keep scrolling for more
Comments on working substance
What made you want to look up working substance? Please tell us where you read or heard it (including the quote, if possible).
Test Your Vocabulary
Challenging Vocabulary Quiz Returns!
-
- Which is a synonym of fuliginous?
Test your knowledge - and maybe learn something along the way.
TAKE THE QUIZ
Test Your Knowledge - and learn some interesting things along the way.
TAKE THE QUIZLove words? Need even more definitions?
Merriam-Webster unabridged
Words at Play
Ask the Editors
Word Games
-
Challenging Vocabulary Quiz Returns!
No tricks, just difficult words.
Take the quiz -
Time Traveler Quiz: Which Word Came First?
Which word entered the English language first?
Take the quiz -
True or False?
Test your knowledge - and maybe learn something along the way.
Take the quiz -
Syn City
Build a city of skyscrapers—one synonym at a time.
Play the game
Share working substance
Resources for working substance