Question

why can a pace or a footstep not be used as a standard unit of length? ​

Answer 1

Answer:

A pace or a footstep cannot be used as a standard unit of length because everybody's bodyparts are different in size and this causes confusion in the measurement of an object that is why we need some common set of units to measure things. These common set of units are International System of Units (SI Units) Hope my answer helps :) . Cheers!!!

Explanation:

Answer 2

Answer and explanation: It is because a pace or a footstep of each and every person is not equal. They may vary in size, which caused confusion and incorrect measurements and a need to get a new measuring system which is correct emerged, which is now so called SI units, which is accepted by the world internationally.