1. Heat Transfer

2. Heat transfer Everything is made of molecules.
When molecules gain energy they move faster and create more heat.
(The faster the molecules move the hotter they are)
Melting
Evaporation
Condensation
Freezing
liquid
Solid
Gas
Molecules move very slowly! They are close together.
Molecules move faster and are more spread apart.
Molecules move very fast! They are very spread apart.

4. Pair/Share What happens to molecules as you add heat?
Are the molecules of water moving faster or slower in cold water? Why
Evaporation is when a Liquid turns into a ____________. Heat is __________.
Freezing is when a _________ turns into a ____________. Heat is _____________.
If the molecules are moving faster and our more spread out. Was heat added or removed?

5. Heat
Is the transfer of thermal energy from a hotter object to a cooler one until both objects are the same temperature.
(You can not transfer cold or give someone cold)
heat transfer video clip

6. Pair/Share Which direction does heat transfer?
A. From warmer to cooler
B. From cooler to warmer
C. both directions
When you touch something cold which direction is heat being transferred? Why?
Explain why you feel cold when you touch something that is cold.

7. 3 ways that heat is transferred within the atmosphere
Radiation
Conduction
Convection

8. Radiation
What creates
electromagnetic waves?
Video clip 1
video clip 2
The direct transfer of energy by infrared electromagnetic Waves.
Sun, fire, light bulbs

10. Conduction conduction video clip 1
The direct transfer of heat from one substance to another substance that is touching.
Stepping on hot sand.
Ironing Clothes
That’s Hot

11. demo of conduction
flame heating molecules

12. Heat video clips\Convection2.asf
convection video clip
Heat video clips\Convection2.asf
The transfer of heat by movement of a fluid (liquids and gases).
Cooking peas in water
OVEN
Dryer
Blow Drying your Hair.

16. Heating the troposphere
Radiation, conduction and convection work together to heat the troposphere.
Radiation- heats the Earth
Conduction- Air near earth’s surface is warmed
Convection- the warm air molecules rise and transfer heat to the cooler air molecules. Eventually these molecules cool and sink back down to earth. This creates Convection Currents.

17. Radiation, Convection and Conduction work together to heat the troposphere.
review of all 3 types
Radiation
Convection Current
Conduction

18. Review
Heat transfer from a hotter object to a cooler object until both objects are the same temperature.
3 types of heat transfer
Radiation – electromagnetic waves
Conduction – touching
Convection- through a fluid (liquid or gas)
All 3 work together to heat the troposphere but Convection causes most of the heating.