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Asked by Sai Last Modified
Answer 
Ekta Vishwakarma
Educator having 8 years of experience in Teaching industry and M.Sc., B.Ed., CTET qualified.
Nuclear Size is expressed in Ferrmi whuch is the order of the nuclear size i.e. 10 raise to power minus 15 metres or 10^(-15) metres. Basically, you are asking about measuring the diameter of nucleus of an atom which is a length. Hence, It's SI unit is still metre.
But Fermi is not the SI unit initself, it is the order like Picometer(10^-12 metres), Angstrom(10^-10 meteres) etc. Don't confuse with order and SI unit.
SI units is a system of physical units, set by International System of Units. They are set for
Length(metre), Mass(Kg), Time(second), Temperature(Kelvin), Electric Current(Ampere), Luminosity(candela) and Amount of substance(mole).
*** For ease of expressing them in calculations, expressions, conversations etc we used to write directly order after the numerical result if these results often come in that scale. For example, a person doing nuclear physics will always get numerical values which are of order fermi.
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