According to this law, for a given sample of a gas, the pressure is inversely proportional to its volume at constant Temperature. That is, if we increase the volume then the pressure decreases and vice-versa. This is obvious as on increasing volume the contact area increases and that’s why pressure decreases. The force remains the same as the temperature is constant.(BOYLE’S LAW).
P ά 1/V
PV = constant
P1V1 = P2V2 = P3V3

If the pressure is doubled, the volume is halved. If the pressure is halved, the volume is doubled.
The study of graphs plays a vital role in understand these laws.

The P-V graph is called “rectangular hyperbola” as it represents a standard curve which follows the equation xy = constant.
Straight lines are obtained when the pressure is plotted against 1/V at constant temperature.
A 1.00 L sample of gas at 760 torr is compressed to 0.800 L at constant temperature. Calculate the final pressure of the gas.
Sol. P1V1 = P2V2
(760) (1) = P2 (0.8)
P2 = 950 torr

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