(iv) A football is being inflated by pumping. In thiscase both pressur

1.	(iv) A football is being inflated by pumping. In thiscase both pressure and volume are increasingDoes this incident violate Boyle's law?
Answer» You should use the gas law here PV=NRT. Boyle's law is the LHS, supposes a constant amount of substance and temperature. If you are adding air to the balloon, then V/N is constant, and the balloon expands because it's getting more air. If you are squashing the balloon then the shape changes. Understand that the balloon is like a piece of elastic, and the pressure inside the balloon is what is stretching it, so the pressure in the balloon is higher than outside. It's very unlikely that pressure would be proportional to volume. What happens is more like in a cup, where the depth (ie P) and surface area (V) give a constant measure (eg volume of water), and were they proportional, then increasing the pressure and volume would mean that you would be adding to NRT at the square

(iv) A football is being inflated by pumping. In thiscase both pressure and volume are increasingDoes this incident violate Boyle's law?

Answer»

You should use the gas law here PV=NRT. Boyle's law is the LHS, supposes a constant amount of substance and temperature.

If you are adding air to the balloon, then V/N is constant, and the balloon expands because it's getting more air.

If you are squashing the balloon then the shape changes.

Understand that the balloon is like a piece of elastic, and the pressure inside the balloon is what is stretching it, so the pressure in the balloon is higher than outside.

It's very unlikely that pressure would be proportional to volume. What happens is more like in a cup, where the depth (ie P) and surface area (V) give a constant measure (eg volume of water), and were they proportional, then increasing the pressure and volume would mean that you would be adding to NRT at the square

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