Learning objective

Explain the process of convection in liquids and gases.

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Cambridge IGCSE Combined ScienceThermal physicsCore content

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Quick explanation

Explain the process of convection in liquids and gases

This point belongs to Transfer of thermal energy, especially Transfer of thermal energy outcomes.
You need to be able to explain the process of convection in liquids and gases.
The key ideas to know are Describe.
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Key concepts

Describe

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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 3 structured question: Transfer of thermal energy

Paper 3Theory (Core)3 marks

Description

Convection Process

In a pot of water being heated on a stove, the water at the bottom heats up first, becomes less dense, and rises to the top, while the cooler water at the top sinks to the bottom, creating a convection current.

a
Explain the process of convection as described in the stimulus.
Your answer
Aim for approximately 3 distinct marking points.
[3]

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Related learning objectives

Recognize and provide examples of effective thermal conductors and ineffective thermal conductors (thermal insulators).
Transfer of thermal energy outcomes
Understand that convection is a significant method of energy transfer in liquids and gases.
Transfer of thermal energy outcomes
Explain thermal conduction in solids through atomic or molecular vibrations and the movement of delocalized electrons in metals.
Transfer of thermal energy outcomes
Clarify convection in liquids and gases based on changes in density.
Transfer of thermal energy outcomes
Recognize that thermal energy transfer via thermal radiation does not need a medium and primarily occurs through infrared radiation.
Transfer of thermal energy outcomes

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