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1.3 Pressure

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Question 6
F

A cylinder is closed by a piston that can slide in and out. The cylinder contains a fixed mass of gas.

The piston is pulled out slowly, so the volume of the gas increases. The temperature of the gas does not change.

a.

Explain, in terms of particles, why the pressure of the gas decreases.

[3]
b.

At the start, the pressure of the gas is 1.2 × 105 Pa.

The piston is pulled out until the volume of the gas is 3 times its starting volume.

Use the equation: pressure×volume=constant\text{pressure} \times \text{volume} = \text{constant}pressure×volume=constant

Calculate the new pressure of the gas.

[2]
Markscheme

1.3 Pressure Questions

  1. GCSE
  2. /Physics
  3. /1.3 Pressure

50 exam-style questions on OCR GCSE Physics 1.3 Pressure, covering 1.3.1 Molecular motion, temperature and gas pressure, 1.3.2 Gas pressure at constant volume, 1.3.3 Compressing and expanding gases, 1.3.4 Gas volume and pressure at constant temperature, 1.3.5 Doing work on a gas, 1.3.6 The Earth's atmosphere and atmospheric pressure, 1.3.7 Atmospheric pressure and height, 1.3.8 Floating and sinking, 1.3.9 Pressure in liquids and upthrust, and 1.3.10 Pressure differences with depth. Each one has a worked solution and a mark scheme showing where the marks go.

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