1. Transfer of Energy

2. How heat (energy) moves. What does “Transfer of Energy” mean?

3. Heathotcold Heat moves from hot cold FLOW of HEAT HIGHTEMPERATURELOWTEMPERATURE SourceSink

4. Heat will always flow from a ______ to a ____ until ________ is reached. Heat (energy) is transferred by _________, _________, or _________. sourcesink equilibrium conductionconvection radiation Source Sink

5. Methods of Heat Transfer 1. CONDUCTION 1. CONDUCTION - Direct transfer from atom to atom caused by molecules vibrating and colliding (touching). most effective in solids, especially metals *most effective in solids, especially metals*

6. Conduction Example Warmer End Cooler End Let’s view a demo…

8. ____ 2. Convection: Transfer of ____ by cyclic movement of fluid. *Based on differing densities.* liquidgas. Ex: liquid & gas. heat

9. Convection Current heat 1. As the water is ______ it becomes _________ and _______ 2. On reaching the surface the water ______ in contact with the air. 3. As the water ______ it becomes _____ _______ and ________ 4. A cycle develops, we call this a __________ ________ or cell. Convection Current Example heated less dense rises. cools more dense sinks. convection current

10. Let’s view a demo…

12. 3. Radiation: Transfer of heat via electromagnetic waves. Can occur in solid, liquid, gas, and space. Let’s view a demo…

13. Conduction Convection Radiation

15. Exercise #3 - Transfer of Energy Label each of the pictures with the primary form of energy transfer that is taking place. *Remember* Conduction, Convection, Radiation. Please work quietly!

16. 1. Radiation!

17. 2. Convection!

18. 3. Conduction!

19. 4. Convection!

20. 5. Conduction!

21. 6. Radiation!

22. 7. Conduction!