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Fig. 3.1 shows a sealed plastic bag containing air. Explain, in terms of particles, how the air exerts pressure on the inside surface of the bag.
A passenger in an aircraft seals some air inside a plastic bag.
Explain how the particles of air in the bag exert a pressure on the inside of the bag.
When the bag is closed, the pressure of the air inside the aircraft is 80 kPa and the bag contains 500 cm³ of air.
When the aircraft is on the ground, the pressure of the air inside the aircraft is 100 kPa.
Calculate the volume of air inside the bag when the aircraft is on the ground.
volume = ...................................... cm³
State one assumption that you made in your calculation in (i).
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Fig. 3.1 shows a sealed plastic bag containing air. The air in the bag has a pressure of 80 kPa and a volume of 500 cm³. The bag is brought down to ground level, where the air pressure is 100 kPa. Sketch on Fig. 3.2 how the volume of the air in the bag varies with pressure. The initial pressure and volume are shown.
The point plotted on the graph in Fig. 3.2 shows the initial pressure and volume of the air inside the bag.
Sketch a line on Fig. 3.2 to show how the volume of the air changes as the pressure increases.
5054/02/SP/23Cambridge O Level Physics 5054 · Specimen 2023 · Paper 2 · Question 3