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.
"In addition, since free energy is a universal thermodynamic metric, our model can be extended to other systems with similar characteristics."
From Science Daily • May 18, 2026
Despite the obvious benefits of free energy and even selling surplus power to the grid, the installation costs are high.
From BBC • Dec. 17, 2025
And imagine if you were charging your car with energy from your own solar panels - you could sell this free energy to the grid for a decent margin, trials have shown.
From BBC • Dec. 7, 2023
To overcome this challenge, experts in academia and industry have compiled the first ever reliable experimental benchmark of solid-solid free energy differences for chemically diverse, industrially relevant systems.
From Science Daily • Nov. 10, 2023
One feels behind it the fine and free energy of a creative spirit.
From Impressions and Comments by Ellis, Havelock
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.
