Mass is a physical quantity with which we quantitatively describe a property of objects, namely their resistance against acceleration. Mass is a scalar quantity, as opposed to a vector quantity, which means it has magnitude but no direction. When physicists introduce a scalar quantity like mass, for example, they seek to develop a conventional system for comparison. If I say heavy, it does not mean much. Heavy for Hulk or heavy for Mickey Mouse? Subjective. Physicists want to be objective. In the SI, kilogram is established as the unit of measurement of mass. What is 1kg?
It was agreed and has been used conventionally ever since that 1kg is equal to the resistance of pure water at
V = 1dm3
T = 277K
. We call this the etalon of mass and we compare unknown masses to this when we measure. Each physical quantity has one etalon. If a body is heavier 2.3 times than the etalon, it means m = 2.3kg.
The relationship between mass and measurement is this:
Kilogram is a unit of measurement for mass.
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