CAIE IGCSE Physics 2.1.3.3 Recall/use: pV = constant for a fixed

Practise Boyle's law with fixed masses of gas, constant-temperature calculations, cylinders, balloons and pressure-volume graphs.

Exam points

calculate unknown pressure or volume using p1V1 = p2V2 with consistent units
interpret inverse pressure-volume graphs for a fixed mass of gas at constant temperature
apply pV = constant to cylinder, piston, bubble and helium balloon contexts

[Maximum number: 2]

A sample of gas is at a pressure of 120 kPa . The volume of the gas is doubled at constant temperature.

Calculate the new pressure of the gas.
pressure =

(pressure =) 60 kPa OR $6.0 \times 10^{4} \mathrm{~Pa}$

A2

$p_{1} V_{1}=p_{2} V_{2}$ OR $\left(p_{2}=\right) p_{1} V_{1} / V_{2}$ OR p V= constant

OR $p \propto 1 / V$ OR $1.2 \times 10^{5} \times 0.5$ OR $6.0 \times 10^{n}$

C1

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2.1.3.3—Recall/use: pV = constant for a fixed question 1