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GCSE Physics · key term
The force exerted normally on each unit area of a surface, caused in a gas by particles colliding with that surface.
Used by AQA, Edexcel and OCR
Specification 4.3.3.3 · Paper 1
Force acting normally per unit area on a surface, produced in a gas by particle collisions with that surface.
Revise: Increasing the pressure of a gasIf their average kinetic energy has also increased, their collisions can be more forceful. These effects increase the gas pressure, so the compressed air can be forced through the valve and into the tyre.
Specification 14.13 · Paper 2
Do not say that gas pressure is caused by the weight of the gas. It results from particle collisions with the container walls.
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Force exerted normally per unit area of a surface; gas pressure results from particles colliding with the walls of their container.
The combined effect of enormous numbers of collisions produces gas pressure.
Specification P1.3b · Paper 1 (Foundation), Paper 3 (Higher)
Revise: Gas temperature and pressureThe combined effect of enormous numbers of collisions produces gas pressure. Because particles travel in every direction, the gas pushes on every wall—not only on the bottom.