Edexcel IGCSE Physics 5.15 Gas Pressure Questions
Use collision rates, force and area to explain gas pressure and why random motion gives equal pressure in every direction.
- Syllabus
- First assessment 2019
- Course
- Physics 4PH1
Exam points
- Define random motion as gas molecules moving in unpredictable directions and at different speeds.
- Explain that collisions between gas molecules and container walls exert a force; force per unit area produces pressure.
- Explain that random motion gives equal rates of collisions in different directions and therefore equal pressure on all container walls.
Edexcel IGCSE Physics 5.15 Gas Pressure Questions question 1
This question is about gas pressure.
Diagram 1 shows some of the molecules of a gas in a sealed container.
Diagram 1
The molecules collide with all the surfaces of the container. This exerts an outward force on the container and causes pressure.
Describe how the motion of the gas molecules causes an equal pressure on all the walls of the container.
You may add to diagram 1 to help your answer.
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