1. Heat Energy Transfer GCSE Physics

2. Textbook reference CCEA Physics, Page 17 – 25 Key words list, what do you think the words and phrases mean? You don’t want to get confused… like President Bush!

3. Learning Intentions State the three types of heat energy transfer Recall in detail how the three types of heat energy transfer occur.

4. Don’t let the cold in!!!

5. Heat Transfer Heat Flow Objects get hot if heat energy (thermal energy) passes into them. We know they get hot because the temperature rises. It is important that we know the difference between temperature and heat: Temperature - the measure of how hot something is, measured in degrees Celsius; Heat - a flow of energy from a hot object to a cold object. Heat is measured in joules (J).

6. Particle motion in a substance

7. Heat Flow Heat always flows from hot to cold. Heat does not flow from a cold object to a hot object. For example the heat from a hotplate passes into a cold pan to heat up the water in the pan. The greater the temperature difference between the hot object and the cold object, the greater is the flow of heat. HOT HEAT COLD

8. Types of Heat Energy Transfer Page 17 TThe three ways in which heat can move (types of heat energy transfer) are… Conduction Convection Radiation

9. Convection

10. 10 Which weighs more?

11. Convection Structure of a Liquid and a Gas Both states of matter flow and carry the heat energy with them.

12. Particles move feely Gain heat energy Move faster and spread out Volume becomes less dense Rises and bringing the heat energy What causes the convection currents?

13.  The movement of hotter areas in a liquid can be seen using potassium permanganate as a dye: H E A T This cycle is called a convection current.  Can you explain how the convection current moves using the idea of density? The diagrams on the left will help you. Change in Density

14. 14 Question Time CCEA Physics Attempt Q 33 pg 24 and Q 5a pg 30

16. Conduction

17. Structure of a Solid (cannot flow)

18. Conduction in Solids

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21. Radiation

22. Application of Heat transfer Trapping layers of air in between bed sheets Skin cancer Cooking utensils A greenhouse Table mats, handles of cooking appliances Air con is usually placed at the top of a room A heating coil of a kettle is at the bottom Formation of land and sea breezes Silver Teapots and pans Different hot and cold touch sensations from objects Colour and texture of clothing Conduction, Convection or Radiation??

23. Newspaper Headlines!

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26. 26 Greenhouse Gases… Water Vapour Carbon Dioxide Methane Halocarbons

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28. Questions Text Book pg 29 Questions 4 – 7

29. The internet can help! http://www.bbc.co.uk/climate/evidence/ Evidence Impacts Adaptation

30. Reducing the runaway greenhouse effect http://www.bbc.co.uk/climate/adaptation/ja ck.shtmlhttp://www.bbc.co.uk/climate/adaptation/ja ck.shtml Life at Home Copy down what we can do to help slow this down!