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What is the basic diffrence in-between "Mass" and "Weight",and what is the unit of both &why,please explain ??

Mass is defined as the amount of matter contained in a body. It is a fundamental quantity that all objects possess. For a particular body its mass will always remain constant irrespective of where its kept.

Its SI units are kilograms (kg).

Weight is defined as the force acting on an object under the influence of gravitational field. So it tells us the amount of gravitational acting on the object. Weight of an object is not a constant and depedns upon the strength of the force and where its kept.

It SI units are Newtons (N)

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Mass is the measure of the inertia of the body. It arises due the total atomic content of the body, namely the constituents of its atoms. Mass is the universal quantity of the matter which remains unaltered irrespective of the place wherever me measure it.

The SI unit of mass is 'kilogram' (Kg)


 

weight of a body is the gravitational force acting on it.

 

Mg

 

If a body of mass 'M' kg is kept somewhere and acceleration due to gravity at that place is 'g' then the gravitational force acting on the body will be F g = Mg

This 'mg' is the weight of the body.

Weight has units of 'Kgf' or 'Newton'


 

-weight of a body changes with the change in the value of 'g'

-weight of the body is not the universal quantity.

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Mass is independent of gravity and it tells us the amount of matter present in the object. It remains constant throughout the universe.

Weight tells us the force with which an object is attracted by the gravitational force, it depends upon gravity and varies from place to place in the universe.

For example our mass remains same whether we are on Earth or on Moon. But our weight on Moon will be different from our weight on the Earth.

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Mass

The mass (m) of a body is the quantity of matter contained in it. It is a scalar quantity which has only magnitude but no direction. The mass of a body is constant and does not change from place to place and it cannot be zero.Mass is a fundamental quantity.

SI unit of mass - Kg

Weight

The weight (W) of a body is the force with which it is attracted towards the center of the earth. Weight is a vector quantity having magnitude as well as direction. The weight of a body is not constant , it changes from place to place . For Eg in interplanetary space g=0 (g=acceleration due to gravity) , thus W =0 (as W=mg).Weight is a derived quantity.

SI unit of Weight= newton (N)

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(1) mass is amount of matter contained in a body. weight is the force with which a body is pulled.

(2) mass is constant everywhere. weight is variable.

(3) mass is measured by a spring balance. weight is measured by a beam balance

(4) SI unit of mass is kg. SI unit of weight is N or kgwt (W=mg => N)

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Mass:- 1. Mass is the total number of molecule present in a body.

2. It is constant.

3. it can be measured my bean balance.

Weight:- 1.The force exerted by earth on us is called weight.

2. It is variable.

3. It can be measured by weight machine.

S.I. unit of mass is Kg. And S.I. unit of weight is Newton (N).

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