Answer :

Boyle’s law states that pressure of gas is inversely proportional to the volume occupied by gas at constant temperature and when no. of moles of gas remain constant.

As volume can be written as mass/density

So Boyle’s law is only applicable when mass of the gas remains constant.

But, when air is pumped into a cycle tyre, the mass of gas inside the tyre continuously increases and thus increases the volume and pressure of gas.

Therefore, Boyle’s law is not applicable here.

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