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Clarify convection in liquids and gases based on changes in density.

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  • Practise with linked questions.
Cambridge IGCSE Combined ScienceThermal physicsSupplement content

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Clarify convection in liquids and gases based on changes in density

  • This point belongs to Transfer of thermal energy, especially Transfer of thermal energy outcomes.
  • You need to be able to clarify convection in liquids and gases based on changes in density.
  • The key ideas to know are Explain.
  • Use the linked flashcards and practice questions to check recall, then practise applying the idea in an exam-style answer.

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Explain

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This objective helps connect Transfer of thermal energy outcomes to exam-style questions, flashcards, and revision notes for Transfer of thermal energy.

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Paper 4 structured question: Transfer of thermal energy

Paper 4Theory (Extended)3 marks

Description

Convection Process

In a heated fluid, warmer areas rise while cooler areas sink, creating a cycle of movement known as convection currents.

  1. a

    Analyse Explain how changes in density lead to convection in liquids and gases.

    Aim for approximately 3 distinct marking points.

    [3]
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Cambridge IGCSECombined Science resources