Question

What should we know in order to measure a physical quantity ?​

Answer 1

Answer:

SI base units are: for length (l) meter (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

☞A property that is measured [e.g. mass, length, time, volume, pressure]. Unit: A standard quantity against which a quantity is measured [e.g. gram, metre, second, litre, pascal; which are units of the above quantities]. ... Many quantities are defined in terms of other quantities(derived quantity)

☞In physics, there are seven fundamental physical quantities that are measured in base or physical fundamental units: length, mass, time, electric current temperature, amount of substance, and luminous intensity

☞A given derived quantity is always expressed in the same type of units. For example, area is always expressed in squared units, such as cm2.