femtometer

noun

fem·to·me·ter ˈfem(p)-tə-ˌmē-tər

-tō-

: a unit of length equal to 10⁻¹⁵ meters : one quadrillionth of a meter

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This explains why the proton and neutron have particular sizes to them, where each one has a radius that’s a little smaller than a femtometer. —

Ethan Siegel, Forbes, 20 Apr. 2021 Finally, the results are in: Hessels and company have pegged the proton’s radius at 0.833 femtometers, give or take 0.01, a measurement exactly consistent with Pohl’s value. —

Quanta Magazine, 11 Sep. 2019 Pohl and his team were surprised to find a lower value for the radius, pegging it at 0.84 femtometer—well outside the range of potential sizes established by earlier measurements. —

Dan Falk, Scientific American, 28 Nov. 2019 The result: their measurement of 0.833 femtometers (just under one-trillionth of a meter) agrees with the smaller value from the 2010 study. —

Jennifer Ouellette, Ars Technica, 5 Sep. 2019