When air is pumped into a cycle tyre, the volume and pressure of the air in the tyre both increase. What about Boyle's law in this case?

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(N/A) Boyle's law states that for a fixed mass of an ideal gas at a constant temperature, the pressure is inversely proportional to the volume $(PV = \text{constant})$.
In this scenario, when air is pumped into the cycle tyre, the mass (number of moles) of the air inside the tyre increases.
Since the mass of the gas is not constant, the conditions required for Boyle's law are not satisfied.
Therefore, Boyle's law is not applicable in this case.

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