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🔬 Science - Class 8
Unit 7 · Energy in Daily Life

Convection Method of Heat Transfer Presentation

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Science and Technology, Class 8

Convection Method of Heat Transfer

Only in liquids and gases · The molecules travel · The cause of wind

What We Will Learn Today

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What convection means and how it happens

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The sea breeze and the land breeze

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Natural convection and forced convection

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Convection in the weather and in daily life

Classroom experiment
Two Beakers of Water
FILL
Fill both beakers two thirds full of water.
COLOUR
Drop a few grains of red ink into each.
HEAT
Heat only one beaker on the wire gauze.
WATCH
Watch the coloured water rise in the middle and sink at the sides.

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Presenter notes: Today we look at how heat spreads by travelling inside water and air. Before starting, ask the class why the water at the top of a pot becomes hot when only the bottom is heated.