In defining the standard of length we have to specify the temperature at which measurement should be made. Are we justified in calling length a fundamental quantity if another physical quantity, temperature has to be specified in choosing a standard?

Explanation

Yes, length is a fundamental quantity, one meter is the distance that contains 1650763.73 wavelengths of orange-red light of Kr-86. Hence, the standard meter is independent of temperature. But the length of object varies with temperature and is given by the relation `L_(t=)L_0(1+alphat)` Therefore, we usually specify the temperature at which measurement is max.