Transfer of Energy
How heat (energy) moves. What does “Transfer of Energy” mean?
Heathotcold Heat moves from hot cold FLOW of HEAT HIGHTEMPERATURELOWTEMPERATURE SourceSink
Heat will always flow from a ______ to a ____ until ________ is reached. Heat (energy) is transferred by _________, _________, or _________. sourcesink equilibrium conductionconvection radiation Source Sink
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*
Conduction Example Warmer End Cooler End Let’s view a demo…
____ 2. Convection: Transfer of ____ by cyclic movement of fluid. *Based on differing densities.* liquidgas. Ex: liquid & gas. heat
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
Let’s view a demo…
3. Radiation: Transfer of heat via electromagnetic waves. Can occur in solid, liquid, gas, and space. Let’s view a demo…
Conduction Convection Radiation
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!
1. Radiation!
2. Convection!
3. Conduction!
4. Convection!
5. Conduction!
6. Radiation!
7. Conduction!