Measurement

• Those physical quantities, which can neither be derived from others nor be further resolved into simpler quantities, are called fundamental quantities.
• Length, mass, and time are the fundamental quantity. And the units of fundamental quantities are called fundamental units or basic units.
• Those physical quantities, which depend on two or more fundamental quantities or power of a fundamental quantity, are called derived quantities. And the units of derived quantities are called derived units.
• For example, Area is a derived quantity. Since area= l × b, so it depends on the power of length.

The standard system of Units In Nepal, some people still use the local units like haat and mana for measurement of length and mass. These units may vary from place to place. So, in order to maintain the uniformity in the measurement of physical quantities, the following standard units are used:

1. MKS system: In this system, mass, time, and length are measured in a kilogram, second and meter respectively. It is also known as the metric system.
2. CGS system: In this system, the length is measured in centimetre, mass in gram and time in second.
3. FPS system: In this system, length, mass, and time are measured in the foot, pound and second respectively.