Question

What is measurement? How is a measurement expressed?

Answer 1

Measurement :

1. Measurement is a comparison of an unknown quantity with a known fixed quantity of the same kind.
2. The value obtained on measuring a quantity is called its magnitude.
3. The magnitude of a quantity is expressed in numbers and in its unit.

Example:

1. To measure the length of a rod, we use a meter scale.
2. If the length to be measured is 15 times the unit meter, then we write the length of the rod = 15 meters.
3. Here, 15 is the magnitude (numerical value) and meter is the unit.

Hence, measurement is expressed as a magnitude followed by unit.