Thermal Energy Transfer F.Q.: How does heat move through materials?

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Presentation transcript:

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 question…why do some materials feel colder than others…remember 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 light…record what you feel? 3. Place a the construction paper between you and your hand…record 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 popcorn…can 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