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law

Example:
PV = k 
Where P is pressure of the gas and V is volume of the gas and k is constant. 
It easily derived by the equation above.
Boyle’s law states that when the gas amount and its temperature the same or held constant, within a closed system, the relation of the pressure exerted by the gas is inversely proportional to its volume. So in the situation, the pressure increases, so its volume decreases.