Topic Summaries

Gas pressure and volume

GCSE > Physics > Eduqas > GCSE Physics Topic Summaries > Volume and gases > Gas pressure and volume
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Science skills: Measuring results

  • If the volume of a gas increases without changing its temperature, then the pressure it exerts will decrease.
    • This is because the particles hit the walls of the container at the same speed but less frequently because of the larger space.
    • The walls will also be larger, so the force per unit area (pressure) will also decrease.
  • For a gas at a fixed temperature, pressure x volume = constant.  This can also be written as pV =  const where:
    • p is the pressure of the gas in Pascals, Pa
    • V is its volume in m³
    • const. is a constant value in Pa m³, which won’t change as p and V change.

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