free energy
Americannoun
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A thermodynamic quantity that is the difference between the internal energy of a system and the product of its absolute temperature and entropy. Free energy is a measure of the capacity of the system to do work. If its value is negative, the system will have a tendency to do work spontaneously, as in an exothermic chemical reaction. Free energy is measured in kilojoules per mole.
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Also called Gibbs free energy
Example Sentences
Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.
Last month, the port announced a partnership with startup Bluecore Energy to develop emissions free energy that could one day help power the port’s operations.
From Los Angeles Times ● Aug. 28, 2026
The council said it would explore community energy schemes and work with organisations offering free energy advice.
From BBC ● Jun. 14, 2026
But the key is the free energy you obtain by letting heat from the air outside do much of the heavy lifting in boiling the refrigerant when it is cold.
From BBC ● Mar. 22, 2026
Quantitatively measuring the free energy differences between crystalline forms is no small challenge.
From Science Daily ● Nov. 10, 2023
One feels behind it the fine and free energy of a creative spirit.
From Impressions and Comments by Havelock Ellis
Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023
Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.
