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Mass

The mass $$(m)$$ of an object is a measure of the amount of substance contained within the object. It is a scalar quantity.

A bowling ball has a larger mass than a ping pong ball.

The sun has a larger mass than the Earth.

The SI unit of mass is the kilogram $$(\text{kg})$$.

The kilogram is defined so that a litre of water is approximately one kilogram.

The table shows the masses of some different items.

Object Hydrogen atom Apple Human Earth Universe
Mass / $$\text{kg}$$ $$10^{-27}$$ $$0.1$$ $$70$$ $$10^{24}$$ $$10^{53}$$
A simple balance used to measure mass.
A simple balance used to measure mass.