GCSE Physics (AQA)

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Calculating Gas Volume & Pressure

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Particle model of matter Particle model and pressure

Calculating Gas Volume & Pressure

3:29 Gas Pressure and Kinetic Theory
Spec 4.3.3.2
Previous Gas Volume & Pressure Next Work on a Gas
  • Gas pressure is inversely proportional to its volume at constant temperature.
  • Pressure (P) is proportional to 1/Volume (V), expressed as P ��� 1/V.
  • If pressure doubles, volume halves.
  • Pressure multiplied by volume is constant: P * V = constant.
  • Equation for systems at constant temperature: P1 * V1 = P2 * V2.
  • Units for pressure can be Pascals, and volume can be meters cubed.
  • Consistent units must be used before and after calculations.
  • Example problem: Calculate initial pressure before compression.
  • Given: V1 = 8 x 10^2 m��, V2 = 5 x 10^2 m��, P2 = 6 x 10^5 Pa.
  • Rearrange equation to solve for P1: P1 = (P2 * V2) / V1.
  • Substitute values: P1 = (6 x 10^5 Pa * 5 x 10^2 m��) / 8 x 10^2 m��.
  • Result: Initial pressure P1 = 3.75 x 10^6 Pa.

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