Particle motion is gases

• Colliding gas particles create pressure
• Particles in gases are free to move around - as they move they collide with each other and with the walls of the container
• when particles collide they exert a force on it
• Pressure is the force exerted by colliding particles - per unit area
• In a sealed container - outward gas pressure is the total force exerted by ALL of the particles in the gas of a unit area of the container walls
• Increasing temperature of a gas can increase its pressure
• increasing the temperature of a gas causes energy to be transferred into the kinetic energy stores of its particles
• The temperature of a gas is related to the average energy in the kinetic energy stores of the particles in the gas - the higher the temperature, the higher the average energy
• Increasing the temperature of a gas increased the average speed of its particles
• for a gas at a constant volume, increasing the temperature increases its pressure

  • As the particles are travelling quicker - they hit the sides of the container more often in a given amount of time
  • each particle has a larger momentum - so they exert a larger force when they collide with the container
  • these factors both increase the total force exerted on a unit area - which increases the pressure