activation energy


Definition of activation energy

: the minimum amount of energy required to convert a normal stable molecule into a reactive molecule

Examples of activation energy in a Sentence

Recent Examples on the Web These create the activation energy required for a high explosive to react. Caroline Delbert, Popular Mechanics, "A Rotating Detonation Engine Would Revolutionize Rocket Launches," 19 Feb. 2020 Finding the activation energy to get out there can be tough with the various barriers to entry. Michelle Li, Teen Vogue, "Fila's Newest Collection Will Get You Outside ASAP," 18 July 2019

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'activation energy.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

First Known Use of activation energy

1924, in the meaning defined above

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Time Traveler for activation energy

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The first known use of activation energy was in 1924

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Cite this Entry

“Activation energy.” Dictionary, Merriam-Webster, Accessed 17 May. 2021.

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More Definitions for activation energy

activation energy

ac·​ti·​va·​tion energy | \ ˌak-tə-ˈvā-shən- How to pronounce activation energy (audio) \

Medical Definition of activation energy

: the minimum amount of energy required to convert a normal stable molecule into a reactive molecule

called also energy of activation

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