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Why do scientists describe matter by mass not weight?

Updated: 8/17/2019
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14y ago

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Actually mass is the quantity of matter which is invariant due to the placement in the space. But weight is the force acting on that matter due to gravitational pull by a massive body such as earth etc., So weight would vary because of variance of acceleration due to gravity present at that place.

Moreover, mass is of two type. One is gravitational mass as it is mentioned above. The other one is inertial mass.

Again this mass is not an absolute value and it is a relative one related to the observer. This is Einstein's concept.

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Q: Why do scientists describe matter by mass not weight?
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