Thermal Energy Transfer F.Q.: How does heat move through materials? Thermal Energy moves from hot to cold in three ways Conduction Convection Radiation Heat flow depends on the temperature difference Heat flows from Warmer temps to colder temps..until. Equilibrium is reached Touch the following items record the list and note how cool each feels. 1. Desk top: 2. Leg of desk: 3. Plastic on chair: 4. Science notebook 5. Glass beaker: Order the items coldest to warmest Thinking questionwhy do some materials feel colder than othersremember the O.A. Share your ideas with your table partner Conduction the transfer of heat through materials by the direct contact of matter Heat transfers between the particles Draw and label these pictures. Point out conduction. The thermal conductivity of a material describes how well the material conducts heat. Watch this Can you think of why the blue dye sank and the red dye rose? Convection Unique to fluids (liquid and gas). Movement of a bunch of hot particles; hot air rises Cold particles sink and begin to warm; warm air rises and begins to cool Do the following test at your stations 1. Turn the light on 2. Hold you hand about 6-10 cm away from the lightrecord what you feel? 3. Place a the construction paper between you and your handrecord what do you feel? Radiation Light energy Heat transfer with no contact. Invisible - like sun rays through space The higher the temperature of an object, the more thermal radiation it gives off Draw this example label all three Radiant Heat When comparing heat transfer for a pot 10 cm above a heating element on a stove, radiant heat accounts for 74% How is heat transferred when the pot sits on the burner? Heat transfer challenge Think of ways people make popcorncan you think of three ways that people make popcorn that are examples of each type of heat transfer ? 1. ? Conduction by 2. ? Convection by 3. ? Radiation by