femtometers

No one is suggesting 10 femtometers, or 0.1 femtometers, or even 1.0 fm or 0.8 fm.

The difference is.04 femtometers and a femtometer is one quadrillionth of a meter.

>> The new measurement puts the size of the proton to around 0.833 femtometers, against the previously accepted figure of 0.842 femtometers.

So to summarize, standard model theory predicted that the radius of the proton would be 0.84 femtometers.

This has a schwarzschild radius of 1485 femtometers (1 femtometer is around size of a proton).

Bacteria build their proteins with ribosomes, which assemble the proteins with atomic precision (about 100 femtometers).

Or they could go to picometers and femtometers giving another 6 orders of magnitude.

Nanometers, angstroms, and femtometers are much more commonly found in the jargon.

Say the nucleus of an hydrogen atom is about 2.4 femtometers wide.

How is it even possible femtometers can be described so simply?

The size of the former is generally a few tens to low hundreds of picometers (1 pm = 1e-12 m) while the size of the latter is just a few femtometers (1 fm = 1e-15 m).

Maybe the universe has some crazy repulsive force when atoms or subatomic particles get really really close (closer than in neutron stars, where atoms are femtometers apart).

"(...) the so- called mean charge radius of the helium nucleus is 1.67824 femtometers (...)"

High energy electron scattering experiments from the 90s and 2000s suggested it was more like 0.88 femtometers I read the wikipedia articles for "proton" and "proton radius puzzle" and the press release we're commenting on.