Question

Write the SI unit of three fundamental units.

Answer 1

Hint: SI system is the metric system that is used universally as a standard for measurements. There are some base quantities that are mutually independent on each other and all other quantities and units can be derived by applying different operations or functions on the base units.

Complete step by step answer:
The fundamental units are the units of the fundamental quantities that are defined by the International System of Units. These units are not dependent on any other unit, and we can derive all other units from them.
Seven fundamental units are:
Mass – Kilogram $(Kg)$
Length – meter $(m)$
Time – second $(s)$
Amount of substance – mole$(mole)$
Electric current – ampere $(A)$
Temperature – Kelvin $(K)$
Luminous intensity – candela $(cd)$
The usage of M, L, and T where,
A base unit, also known as a fundamental unit is a unit adopted for measurement of a base quantity. A base quantity is the one which is a conventionally chosen subset of the physical quantities, where no quantity inside the subset can be expressed in terms of the others.
The SI base units are the standard units of measurements which are defined by the International System of Units (SI) for the base quantities, also called as international system of quantities. These units are used universally in technical and scientific research to avoid the confusion with the units.
The fundamental quantities and their SI units are: the kilogram for mass, the metre for measurement of length, the second for time, the mole for amount of substance, the ampere for electric current, and the candela for luminous intensity.
M=mass
L=length
T=time
is the most preferred base unit in the dimensional formula as it gives us perfectly linear and a fundamental dimensional analysis.
SI units of the three fundamental units:
Mass – Kilogram
Length – metre
Time – second

Note:
Having a fundamental and standard unit of system is important because it helps the entire world to understand the measurements in a single set of unit systems. The fundamental units are mutually independent and hence are called base units. Derived units are formed by different operations on base units.