CAIE IGCSE Physics 2.1.2.7 Pressure & the changes in pressure
Practise explaining gas pressure with momentum ideas, from molecules rebounding off surfaces to force spread over an area.
- Syllabus
- 2026–2028
- Course
- Physics 0625
Exam points
- explain wall force from molecules colliding, rebounding and changing momentum
- link force to rate of change of momentum, then pressure to force per unit area
- interpret particle-wall collision diagrams by choosing momentum change as the cause of pressure
2.1.2.7—Pressure and the changes in pressure question 1
[Maximum number: 2]
A balloon contains a fixed mass of gas.
Explain, in terms of the momentum of molecules, how the gas in the balloon exerts a pressure.
impulse/change of momentum (of molecules) during collision
B1
\{force (to change momentum) of molecules OR molecules hitting walls\} (causes pressure)
B1
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