Question

What is mass? Mention the \[S.I.\] and \[C.G.S.\] unit of mass.

Answer 1

Hint: The international standard of Units \[\left( S.I. \right)\]commonly known as the metric system is the international standard of measurement as signed by the International Treaty of the Meter. The \[S.I.\]is made up of $7$ base units that define the $22$ derived units with special names and symbols. It does play an essential and important role in international commerce and commonly used in scientific and technological research and development.
\[C.G.S.\]system of units is the second self-consistent system after \[S.I.\]and uses centimeters, grams and seconds for measurement of length, mass and time respectively, thus, the name. It is often known or referred as the Gaussian system or the electrostatic system.

Complete step by step answer:
Mass, as far as its physical definition is considered, can be defined as the quantitative measure of Inertia, a fundamental property of all matter. It is, in effect, the resistance that a body of matter offers to a change in its speed or position upon application of force. The greater the mass of the body, the smaller is the change produced by an applied force.
The standard \[S.I.\]unit of mass is kilogram or $kg$;
Whereas the standard \[C.G.S.\]unit of mass is gram or $g$.

Note: One is advised to take not of and remember that weight, though seems to be and is related to mass but is not exactly equal to the latter as Weight essentially constitutes the force exerted on matter by the gravitational attraction of Earth and varies from place to place unlike mass.