Particle motion in gases

• • The molecules of gas are in constant random motion
  • the temperature of the gas is related to the average kinetic energy of the molecules
• Changing the temperature of a gas, held at constant volume, changes the pressure exerted by the gas
• Pressure increases as temperature increases (at a constant volume) because:

  • Kinetic energy of molecules increases
  • collisions between molecules become more frequent
  • greater rate of change of momentum
  • greater force and therefore pressure