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# 2.3 Understanding thermal energy

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Thermal energy transfer, conduction, convection, radiation

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### 2.3 Understanding thermal energy

1. 1. 10 October 2010<br />2.3 Understanding thermal energy<br />Order these objects in the lab from coldest to warmest. Go touch them to help you decide.<br />Wooden desk<br />Metal tap<br />Plastic whiteboard<br />Tiled floor<br />Concrete wall<br />
2. 2. Metal container<br />Which ice cube melts quicker?<br />Cardboard<br />
3. 3. Conduction<br />
4. 4.
5. 5. Conduction<br />Atoms vibrate, the higher the temperature the greater the temperature.<br />Metals are the best conductors as they have lots of free electrons.<br />
6. 6. Activity A<br />Imagine heating up some baked beans in a metal saucepan. You stir the beans with a metal spoon. Using the idea of conduction, explain why the spoon gets hot.<br />
7. 7. Convection<br />
8. 8.
9. 9. Convection<br />The atoms in fluids are free to move. When they do so they transfer heat – this is called convection<br />
10. 10. Activity B<br />Now imagine heating up some soup. Even if you don’t stir it, the whole pan of soup eventually heats up. Use the principle of convection to explain why.<br />