GCSE Combined Science (AQA)

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Pressure from a Gas

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Particle model of matter Particle model and pressure

Pressure from a Gas

4:26 Gas Pressure and Kinetic Theory
Spec 4.3.3.1 4.3.3.2
Previous Kinetic Theory of a Gas Next Demonstrating Gas Pressure
  • Gas particles frequently collide with container walls.
  • Gases consist of particles that spread out and move randomly.
  • Collisions with walls cause particles to change direction and bounce.
  • Particles exert a force at right angles to the wall during collisions.
  • Walls enact a reaction force to change particle direction.
  • Particles also exert a reaction force on the walls.
  • These forces are at right angles to the surface.
  • Pressure from gas is the net outward force from all collisions.
  • Pressure is a force spread across a surface.
  • Millions of gas particles in a container result in overall force across walls.
  • Increasing gas temperature causes more frequent and forceful collisions.
  • Temperature affects the kinetic energy of gas particles.
  • Low temperature: slow particles; high temperature: fast particles.
  • Fast particles travel further and collide more often.
  • Greater change in velocity during collisions means stronger forces.
  • Faster particles cause greater impact during collisions.
  • Increasing temperature at constant volume increases pressure.
  • Temperature increases can also change gas volume.
  • Important to specify constant volume when discussing pressure-temperature relation.
  • Steel gas canister's size unaffected by gas pressure.
  • Heating gas increases temperature, causing faster particle movement.
  • Faster particles lead to more frequent and stronger wall collisions.
  • Gas exerts greater pressure on the container when heated.

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