2. July 2005web site: www.ktaggart.com2 Heat Energy Heat is the form of energy that flows from a hot region to a cold region because of the temperature difference between the two regions. Heat energy is also called thermal energy. Heat energy flows by one or more of the processes of: 1.CONDUCTION 2.CONVECTION 3.RADIATION 4.EVAPORATION

3. July 2005web site: www.ktaggart.com3 1. Conduction This is how heat energy flows from a hot to cold region of a substance without the molecules of the substance moving from the hot to cold region. Click here to view more information about thermal conduction: Thermal ConductionThermal Conduction - Powerpoint presentation by KT

4. July 2005web site: www.ktaggart.com4 2. Convection This is how heat energy flows from a hot to cold region of a substance by being carried by the molecules of the substance moving from the hot to cold region Click here to view more information about convection: ConvectionConvection - Powerpoint presentation by KT

5. July 2005web site: www.ktaggart.com5 3. Radiation This is how heat energy moves from a hot to cold region by means of electromagnetic radiation. Click here to view more information about thermal radiation: Thermal RadiationThermal Radiation - Powerpoint presentation by KT

6. July 2005web site: www.ktaggart.com6 4. Evaporation This is how heat energy moves from a liquid to a vapour by some of the molecules of the liquid moving to the vapour. Click here to view more information about evaporation: EvaporationEvaporation - Powerpoint presentation by KT

7. July 2005web site: www.ktaggart.com7 A model of heat transfer processes 1.CONDUCTION – book passed from student to student. 2.CONVECTION – book taken a student to the back of the room. 3.RADIATION – book thrown to the back of the room. 4.EVAPORATION - ???

8. July 2005web site: www.ktaggart.com8 Heating a room using a water radiator Hot water heats the metal radiator by conduction. The outer metal surface heats air in contact by conduction and radiation. Hot air circulates a room by convection.

9. July 2005web site: www.ktaggart.com9 Reducing heat transfer using a vacuum flask 1.CONDUCTION – reduced by the vacuum, stopper, glass, cork and air spaces. 2.CONVECTION – reduced by the vacuum, stopper and trapped air spaces. 3.RADIATION – reduced by the silvered glass walls. 4.EVAPORATION – reduced by the stopper.

10. July 2005web site: www.ktaggart.com10 Question 1 Choose appropriate words to fill the gaps in the paragraph below: _________ is the form of energy that ________ from a hot place to a cold one because of the __________ difference between these two places. Heat moves by conduction, ____________, radiation and evaporation. Thermal energy is an alternative name for ________energy.

11. July 2005web site: www.ktaggart.com11 Question 2 part of flaskprocesses reduced (eg ‘conduction’) Write down the ways in which a vacuum flask reduces heat transfer in the table below:

12. July 2005web site: www.ktaggart.com12 Question 3 device or part of a houseprocesses reduced Write down six diffrent ways in which heat flow from a house can be reduced reduces in the table below:

13. July 2005web site: www.ktaggart.com13 Question 4

14. July 2005web site: www.ktaggart.com14 Puzzles Heat Transfer CrosswordHeat Transfer Crossword - by KT Heat Transfer Word SearchHeat Transfer Word Search - by KT Heat Transfer Word ScrambleHeat Transfer Word Scramble - by KT Heat Transfer Tile PuzzleHeat Transfer Tile Puzzle - by KT Heat Transfer CryptogramHeat Transfer Cryptogram - by KT

15. July 2005web site: www.ktaggart.com15 Related Presentaions ConvectionConvection Powerpoint by KT Thermal RadiationThermal Radiation Powerpoint by KT EvaporationEvaporation Powerpoint by KT Heat Energy TransferHeat Energy Transfer Powerpoint by KT