Pressure and temperature of gases: Particle model of matter: Physics: GCSE (9:1)

• Motion of gas particles

  Move very quickly in random directions

  
• Speed of gas particles

  On average, particles in a gas move much quicker than they do in liquids and solids

  
• Temperature of a gas

  Related to the average kinetic energy of the gas molecules
• Collision


  When contact is made between two particles, a particle and the wall of its container or a particle and something else in the container

  
• Direction of forces which act due to collisions

  At right angles (normal) to the walls of the container
• Pressure


  The force exerted over a specific area
• Gas pressure


  The pressure caused by collisions between a particle and the walls of its container

  
• Reasons gas pressure increases

  When there are more particles colliding with the walls each second or if the particles are moving faster
• Effect on pressure when the temperature of a gas increases

  The pressure of the gas also increases providing the mass and the volume of the gas stays the same
• Relationship between gas pressure and temperature

  The pressure and temperature of a gas are directly proportional
• Directly proportional


  When a graph of two variables is a straight line passing through the origin
• Reasons why increasing the temperature of a gas also increases the pressure

  The gas particles will be travelling faster, will collide with the walls of the container more frequently, and will collide with more force