Concepts of Mass – Defination of one kg mass (1kg)
Concepts of Mass
“ Mass of a body is defined as the quantity of matter in the body, which can never be zero.”
The mass of a body is not affected by the presence of other bodies or by the changes in location of the body. Usually, we define two types of masses of a body: inertial mass and gravitational mass.
The inertial mass of a body is measure of inertia of the body and gravitational mass of a body is a measure of gravitational pull of earth on the body. The values of the two types of masses of a body are identical.
The most common unit of mass is kilogram. Originally, one kilogram was defined as the mass of one cubic decimeter of water at 4 degree centigrade.
This definition was later changed.
One kilogram mass is defined now as – the mass of the international prototype of the kilogram ( which is a standard block of Platinum Iridium alloy preserved in the International Bureau of Weights and Measures, near Paris, France).