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