Question

What is a unit? write the s.i unit of length and mass

Answer 1

A unit of length equal to one hundred-millionth of a centimetre, 10−10 metre, used mainly to express wavelengths and interatomic distances.

the SI unit of length is a metre.

The SI unit of mass is the kilogram (kg).

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Answer 2

The meter, symbol m, is the SI unit of length. It is defined by taking the fixed numerical value of the speed of light in vacuum c to be 299 792 458 when expressed in the unit m s-1, where the second is defined in terms of ΔνCs. Unit of mass. kilogram. The kilogram, symbol kg, is the SI unit of mass..
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