1. Transferrring Energy
Unit 3 – Topic 6

2. 3 Ways Heat Can Travel
Listen...
Radiation
Conduction
Convection

3. POPCORN! 3 ways to make it Oil, pan, stove Hot air popper Microwave
What does that have to do with
Radiation
Conduction
Convection

4. Conduction
Heating metal – what happens? Particles vibrate, making adjacent particles vibrate….and so on and so on. As the vibrations are passed along so is the heat.

5. Conduction
Why does metal feel colder than wood if they are both the same temperature?
Metal = conductor; wood = insulator Metal conducts heat away from hands Wood is a HEAT INSULATOR – less efficient at transferring energy

6. Convection Heat transfer by fluids Convection Current
Moving fluid that carries heat with it
Warm air expands & rises
Cools off, contracts, falls

7. Convection Applications
Weather systems
The current is the breeze
Part of hurricane formation
Heating homes
Hot upstairs; cooler downstairs

8. Radiation Transfer of energy without any movement
Electromagnetic radiation (EMR)
Travels in waves
Absorbed and reflected by objects
Travel at approx. speed of light

9. POPCORN! Your challenge – explain which
energy transfer process is used
for each method of cooking
popcorn. THEN explain why!
Oil, pan, stove
Hot air popper
Microwave