Prout (unit)

The prout is an obsolete unit of energy, whose value is:

$1\ {\text{prout}}=2.9638\times 10^{-14}\ {\text{J}}$

This is equal to one twelfth of the binding energy of the deuteron.

History

The "prout" is a unit of nuclear binding energy, and is 1/12 the binding energy of the deuteron, or 185.5 keV.

This unit is named after William Prout, who first proposed a quantum of mass.

"Proutons" was an early candidate for the name of what are now called protons.^{[citation needed]}

This unit was used in the mid-19th century by several physicists, including Marignac, who first proposed it in 1844.

1 2 Cardarelli, Francois (2012). Scientific Unit Conversion: A Practical Guide to Metrication. Springer London. p. 284. ISBN 9781447133940. Retrieved November 1, 2025.
↑ "William Prout, physicist and chemist whose discovery led Ernest Rutherford to name the proton". Rincón educativo. Retrieved 2025-10-25.
↑ Strong, W.W. (1918). "The Unique System of Units". American Physical Society. 13 (2): 141. Retrieved November 1, 2025.
↑ Hopkins, B. Smith (1923). Chemistry of the Rarer Elements. D.C. Heath. p. 2. Retrieved November 1, 2025.

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