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YoctogramThe prefix yocto- is used to multiply the coefficient 10^-24 to the value of a physical quantity, so 1 yoctogram equals 1 * 10^-24 grams. Warning: yocto- (yg) should not be confused with yotta- (Yg). The coefficient is close to the reciprocal of Avogadro's number: Although the amu is often convenient as a unit, one may sometimes want to use yoctograms to relate easily to other SI values. It can be used for masses of nucleons, atoms and molecules. It is a little large for light particles, but yocto- is the last official prefix in the sequence. (For lengths such as the radius of an atom or even a proton the SI-prefixes are more than sufficient, but masses are proportional to the third power of the length, so one runs out of prefixes sooner; for volumes the extent of the range of prefixes is quite large, but the steps between them are very large too, e.g. 1nm3 = 1 000 000 000 pm3). - Mass of electron: 0.000 91 yg
- Mass of proton : 1.672 6 yg
- Mass of neutron: 1.674 9 yg
Conversion of density: 1 kg/m3 = 1 yg/nm3. None Further << yoctogram << zeptogram See also
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