Question

What is a fundamental physical quantity? Name the fundamental physical quantities.

Answer 1

Hint: Physical quantities are the quantities of the material or a system that can be quantified by measuring them. They can be expressed as the combination of a numeric value and a unit. There are two forms of fundamental quantities. One is the fundamental quantities and the other is derived quantities.

Complete answer:
The quantities that are easily measured are known as fundamental physical quantities.
The quantities which cannot be measured practically but can be derived mathematically are known as the derived physical quantities.
In physics, different fundamental physical quantities are measured using physical fundamentals. The fundamental physical quantities are:
1. Length
2. Mass
3. Time
4. Electric current
5. Temperature
6. Amount of substance
7. Luminous Intensity
8. Plane angle
9. Solid angle
The last two units’ Plane angle and Solid angle, are subsidiary units used in the SI unit system but are treated as dimensionless. The subsidiary units are used for convenience to differentiate between a truly dimensionless quantity and an angle, which are different measurements.
There are the main seven fundamental physical quantities. The angles are not included in the list of these seven quantities. The seven quantities and their units are:

Fundamental quantity	Unit
Length	Meter (m)
mass	Kilogram (kg)
Time	Second (s)
Electric Current	Ampere (A)
Temperature	Kelvin (k)
Amount of substance	Mole (mol)
Luminous Intensity	Candela (cd)

Note:
The current can also be derived if we know the no of charges flowing in the conductor. But it is easy to measure the current using some instruments such as an ammeter than counting the no of charges flowing in the circuit. Thus current is considered as the fundamental physical quantity and charge is a derived quantity.