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Change in temperature causes change in pressure

A change in temperature of a gas leads to a change in pressure (assuming mass and volume are fixed).

When water in a covered saucepan is allowed to boil, you will find it increasingly difficult to keep the lid on to avoid steam from escaping. This is because the increase in temperature leads to an increase in pressure.

Increasing the temperature of a gas means that the gas particles have more energy and so move faster:

  • The gas particles will hit the walls of the container more often.
  • On average, gas particle hit the walls with more force.

This increases the pressure of the gas.

Remember, this is only true if the volume and mass of gas do not change.

 The pressure of a gas at a constant volume increases as the temperature is increased.
The pressure of a gas at a constant volume increases as the temperature is increased.