Lawson criterion

American  

[law-suhn krahy-teer-ee-uhn] / ˈlɔ sən kraɪˈtɪər i ən /

noun

Physics.

1. (in a hypothetical nuclear fusion reactor) the requirement that in order for the energy produced by fusion to exceed the energy expended in causing the fusion, the product of the density of the fuel and the time during which it is confined at that density the Lawson product must be greater than a certain number that depends on the kind of fuel used.

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Etymology

Origin of Lawson criterion

Named after John David Lawson (1923–2008), English physicist, who formulated it in 1957

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Example Sentences

See Examples For:

Lawson criterion

Treating the Lawson criterion as a single unchanging threshold overlooks physical processes that can substantially alter the requirements for ignition.

From Science Daily ● Oct. 10, 2026

Known as the Lawson criterion, this equation defines the conditions required for ignition.

From Science Daily ● Oct. 10, 2026

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