Energy On the Move: Convection

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Presentation transcript:

Energy On the Move: Convection Convection occurs in liquids and gases including air.

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Resources for investigation Small plastic bottle with lid (yogurt drink/travel bottle) Needle (to make a small hole) Thread Food colouring Beaker or glass (must be transparent) Hot water Cold water Small pebble or piece of blutak or playdough Method: Put a small hole in the lid of the bottle and place a thread through it. Place a pebble or a piece of blutak or playdough inside the bottle to weigh it down. Tie a knot in the thread. Fill the bottle with hot water and add 2 or 3 drops of food colouring. Ask the children what they think will happen if you submerge the bottle of coloured water into a beaker of cold water. Ask them to give a reason for their predictions. Ask each child to draw a diagram of what they think will happen. Drop the bottle of hot coloured water into the beaker of cold water and observe. Discuss the observations.

Prediction Question: What do you think will happen when you put the bottle of hot coloured water into the beaker of cold water?

Questions for discussion following the investigation

Revision – image showing what happened