Pressure and temperature

If the volume of a container with a gas inside stays the same, the pressure of a gas increases as its temperature increases.

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The temperature of a gas is a measure of the average kinetic energy of its particles - the higher the temperature, the higher the average kinetic energy.

As a result, the gas particles will be travelling faster and will collide with the walls of the container more frequently, and with more force.

This means that there is a relationship between pressure and temperature. If a pressure gauge is connected to a flask of air and the flask is heated, a graph of pressure against temperature can be produced.

Graph of pressure against temperature. The line starts at 0 degrees C and three units of pressure, rising steadily to six units of pressure at 100 degrees C.

As the temperature increases, the pressure increases showing that pressure is directly proportional to temperature.