Question

It is the process of comparing an unknown quantity with a known quantity

Answer 1

The process of comparing an unknown physical quantity with a known standard quantity of the same kind is called measurement. 

Answer 2

Measurement is the process of comparing an unknown quantity with a known quantity.

• It involves a physical quantity that has to be compared against a standard quantity.
• These physical quantities are weight, length, height, duration, speed, etc. Some major units of measurement are grams, meters, liters.
• Devices of measurement are also available. They are scales, weights, and other devices.
• On comparing an unknown quantity with a known quantity, it gets easier to compare and utilize the thing measured.