Question

Explain the international system of units and define the different fundamental units?

Answer 1

Unit can be defined in simple words as the standard for measurement.International system of unit: International System of Units are used universally because they are used in research and for scientific calculations and it is accepted all over by the world. They are divided into two types: derived units and base units.

Complete Step by step solution:
International system of unit: There are seven basic fundamental units which are
Length $\left( L \right)$. The SI unit is Meter.
Mass $\left( M \right)$. The SI unit is Kilogram.
Time $\left( T \right)$. The SI unit is Second.
Electric current $\left( I \right)$. The SI unit is Ampere.
Thermodynamic temperature $\left( T \right)$. The SI unit is Kelvin.
Amount of substance $\left( N \right)$. The SI unit is Mole.
Luminous intensity $\left( J \right)$. The SI unit is Candela.
Other $22$ derived units have its specific symbol and specific name. Such as, square meters for area, distance per unit time for speed etc.
The reason behind forming an international system of units is to provide the same value for measurements such as length, time, weight all over the world.
SI base units are fundamental units and are considered as the backbone of the unit system. SI derived units are derived from base units like frequency, force etc.

Note:
Unit is also used in conversion of one type of quantity into another type. Same physical property has many units and we need to converse one type of unit to another for its use. Units are also used for dimension analysis of equations.
SI system is based on accurate and precise standards.
Even without the use of conversion factors the SI units can be derived from one another.