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.
The council said it would explore community energy schemes and work with organisations offering free energy advice.
From BBC • Jun. 14, 2026
"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
But for Mr Baker's ice cream factory, it meant free energy.
From BBC • Aug. 27, 2025
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
As a University Professor of Physics with a background in energy usage, I set out to develop a means of cooking food and sterilizing water using the free energy of the sun.
From The BYU Solar Cooker/Cooler by Jones, Steven E.
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.
