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2. 2. Heat Transfer• Heat always moves from a warmer place toa cooler place.• Hot objects in a cooler room will cool toroom temperature.• Cold objects in a warmer room will heat upto room temperature.
3. 3. Question• If a cup of coffee and a red popsicle wereleft on the table in this room what wouldhappen to them? Why?• The cup of coffee will cool until it reachesroom temperature. The popsicle will meltand then the liquid will warm to roomtemperature.
4. 4. Heat TransferMethods• Heat transfers in three ways:–Conduction–Convection–Radiation
5. 5. ConductionWhen you heat a metal strip at one end, the heattravels to the other end.As you heat the metal, the particles vibrate, thesevibrations make the adjacent particles vibrate, and so onand so on, the vibrations are passed along the metal andso is the heat. We call this? Conduction
6. 6. Metals are differentThe outer e______ of metal atomsdrift, and are free to move.When the metal isheated, this ‘sea ofelectrons’ gain k_____energy and transfer itthroughout the metal.Insulators, such as w___ and p____, do nothave this ‘sea of electrons’ which is why theydo not conduct heat as well as metals.lectronsineticood lastic
7. 7. Why does metal feel colder than wood, if theyare both at the same temperature?Metal is a conductor, wood is an insulator. Metalconducts the heat away from your hands. Wooddoes not conduct the heat away from your hands aswell as the metal, so the wood feels warmer thanthe metal.
8. 8. ConvectionWhat happens to the particles in a liquid or agas when you heat them?The particles spread out andbecome less dense.This effects fluid movement.What is a fluid?A liquid or gas.
9. 9. Fluid movementCooler, more d____, fluidssink through w_____, lessdense fluids.In effect, warmer liquids andgases r___ up.Cooler liquids and gases s___.ensearmeriseink
10. 10. Water movementHot waterrisesCoolerwater sinksConvectioncurrentCools at thesurface
11. 11. Why is it windy at the seaside?
12. 12. Cold air sinksWhere is thefreezercompartmentput in a fridge?FreezercompartmentIt is put at thetop, becausecool air sinks,so it cools thefood on theway down.It is warmerat thebottom, sothis warmerair rises anda convectioncurrent isset up.
13. 13. The third method of heat transferHow does heat energy getfrom the Sun to the Earth?There are no particlesbetween the Sun and theEarth so it CANNOTtravel by conduction orby convection.?RADIATION