Question

Why does a measurement need both a number and a unit' for its complete
specification?​

Answer 1

Explanation:

A measurement needs both a number and a unit for complete specification because : If we just say 6, the other person will not understand what we mean; hence we have to use a unit of length. If we just say metres, the person will wonder how many metres; therefore we have to tell the number to express the right quantity.

Answer 2

Answer:

we known that measurement is the process of comparing an unknown quality with a known quantity where the no quantity is called unit. while measuring some physical quantity with a unit we need to express the number of time that physical quantity is the term of that unit number of time and unit give the complete specification