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To demonstrate Boyle's law, we require a syringe and a few small balloons.
At first, let's remove this syringe and place a balloon inside.
When we push the plunger in, the air pressure increases and reduces the volume of gas in the balloon.
On pulling out the plunger the air pressure is reduced and the volume of gas in the balloon increases.
So, the pressure exerted by a gas held at a constant temperature varies inversely with the volume of the gas
This was proved by a scientist called Robert Boyle in the year 1662.