CAIE IGCSE Physics Convection Current Explanations

Practise constructing convection explanations from particle motion and density changes and apply the cycle to radiators, cooled water and sea breezes.

Exam points

state that heating makes particles move faster and spread out, lowering fluid density
show warmer less-dense fluid rising while cooler denser fluid sinks to replace it
trace replacement flow to complete the current in a room, beaker or sea-breeze diagram

[Maximum number: 3]

Fig. 4.1 shows a heater used to warm the air in a room.

Fig. 4.1

Explain how the heater warms all the air in the room.

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2.3.2.2—Convection in liquids and gases in question 1