Question

what is unit . what should we know in order to measure a physical quantity ​

Answer 1

Answer:

SI base units are: for length (l) metre (m), for mass (m) kilogram (kg), for time (t) second (s), for electric current (I,i) ampere (A), for thermodynamic temperature (T) kelvin (K), for amount of substance (n) mole (mol), for luminous intensity (Iv) candela (cd).

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Answer 2

Answer: Unit is the quantity of a constant magnitude which is used to measure the magnitudes of othe quantities of the same nature.

In order to measure a physical quantity, we need to know the nature of the quantity and the unit that we we should be measuring it in.

Explanation: