This video introduces the topic of convection. When a fluid (liquid or gas) is heated it expands, becomes less dense and rises up. When a fluid (liquid or gas) cools it condenses, becomes more dense and sinks. This is called convection.

Convection causes hot pockets within a fluid to rise and cold pockets to sink. This is why the water at the top of a hot bath is warmer than at the bottom and is the cause of convection currents.

Thanks for watching,

Lewis

Relevant for GCSE Physics 9-1 in the following exam boards:
AQA (including Trilogy) (not specifically relevant but recommended)
Edexcel (Physics only)
WJEC (Higher only)
CIE (Cambridge International Examinations) IGCSE
Edexcel International IGCSE

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