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Use the equation pV = constant for a fixed mass of gas at constant temperature, and represent this relationship graphically.

Read the explanation, check the common trap, then practise with flashcards and questions.

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  • Practise with linked questions.
Cambridge IGCSE PhysicsThermal physicsSupplement content

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Use the equation pV = constant for a fixed mass of gas at constant temperature, and represent this relationship graphically

  • This point belongs to Gases and the absolute scale of temperature, especially Gases and the absolute scale of temperature outcomes.
  • You need to be able to use the equation pV = constant for a fixed mass of gas at constant temperature, and represent this relationship graphically.
  • The key ideas to know are Recall, Use, and Show.
  • Use the linked flashcards and practice questions to check recall, then practise applying the idea in an exam-style answer.

Key concepts

RecallUseShow

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This objective helps connect Gases and the absolute scale of temperature outcomes to exam-style questions, flashcards, and revision notes for Gases and the absolute scale of temperature.

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Paper 4 structured question: Gases and the absolute scale of temperature

Paper 4Theory (Extended)1 marks

Description

Pressure-Volume Relationship

A gas is contained in a cylinder with a movable piston. When the piston is pushed in, the volume of the gas decreases, and the pressure increases. Conversely, pulling the piston out increases the volume and decreases the pressure.

  1. a

    State the relationship between pressure and volume for a fixed mass of gas at constant temperature.

    Aim for approximately 1 distinct marking point.

    [1]
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