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A yoctometre (American spelling: yoctometer, symbol: ym) is an SI measure of length that is equal to 10-24 (yocto) of a metre. A yoctometer is equivalent to 1/100 of the diameter of an electron, and 1/100 000 the diameter of a proton or neutron.
- 1 ym = 1 × 10-24 metre
See also 
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