A sealed pump contains air at 120 kPa with a volume of 75 cm3. The air is compressed rapidly to 30 cm3 and its pressure is immediately 360 kPa. The plunger is then held fixed until the air returns to its original temperature.
Use p1V1=p2V2p_1V_1=p_2V_2p1V1=p2V2 for states at the same temperature.
What is the decrease in pressure during cooling?
240 kPa240\,\mathrm{kPa}240kPa
300 kPa300\,\mathrm{kPa}300kPa
60 kPa60\,\mathrm{kPa}60kPa
312 kPa312\,\mathrm{kPa}312kPa
108 exam-style questions on Edexcel GCSE Physics 14.3 Gas pressure and temperature, covering 14.3.1 Gas pressure and particle motion, 14.3.2 Temperature and pressure at constant volume, 14.3.3 Absolute zero and the kelvin scale, 14.3.4 Compressing and expanding gases, 14.3.5 Volume and pressure at constant temperature, and 14.3.6 Doing work on a gas. Each one has a worked solution and a mark scheme showing where the marks go.