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1.3 Pressure

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Question 16
H

A helium gas cylinder has a volume of 0.020 m3. When the cylinder is full, the pressure of the helium inside it is 1.5 × 107 Pa.

The helium is used to fill party balloons. Each balloon holds 0.0060 m3 of helium at atmospheric pressure.

Atmospheric pressure = 1.0 × 105 Pa

Assume that the temperature of the helium does not change.

a.

Calculate the volume that the helium in the full cylinder would have at atmospheric pressure.

[3]
b.

Calculate the greatest number of balloons that can be filled from the cylinder.

[3]
c.

Explain, in terms of particles, why the pressure in the cylinder decreases as the helium is let out.

[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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