1. HEAT TRANSFER CONDUCTION, CONVECTION AND RADIATION

2. I. Thermal Energy
HEAT (thermal energy) is produced from the motion of molecules.
The amount of heat depends on how fast the molecules move.
As molecules move FASTER, more heat is produced.
Temperature measures how fast (kinetic energy) the molecules are moving.

3. Question
Why is Frosty melting

4. E. Heat always transfers from a warmer to a cooler object.

5. 3 Ways Energy (Heat) is Transferred
Radiation
Conduction
Convection

6. Thermal Energy Transfer
Thermal energy transfer is heat moving from a warmer object to a cooler object. This is known as thermal energy transfer.

7. How is Heat Transferred?
There are THREE ways heat can move.
Conduction
Convection
Radiation

8. CONDUCTION
Heat is transferred from one particle of matter to another in an object without the movement of the object.
Conduction = CONTACT

9. Have you ever…
Touched a metal spoon sitting in a pan of boiling water only to be surprised by HOW hot it is??
Think back to what you know about metals and nonmetals. What conducts heat better, metal or nonmetal? Why?

10. Example of Conduction
Think of a metal spoon in a pot of water being heated.
The fast-moving particles of the fire collide with the slow-moving particles of the cool pot.
Because of these collisions, the slower particles move faster and heat is transferred.
Then the particles of the pot collide with the particles in the water, which collide with the particles at one end of the spoon.
As the particles move faster, the metal spoon gets hotter. This process of conduction is repeated all along the metal until the entire spoon is hot.

11. EXAMPLE OF CONDUCTION
A piece of cheese melts as heat is transferred from the meat to the cheese (Contact)

12. CONVECTION
Convection is the movement that transfers heat within fluids and air (gas)
Heat is transferred by currents within the fluid or gas
Convection = VENTS
(through air and liquid particles)
Convection moves in
a circular pattern

13. Examples of Convection:
Have you ever noticed that the air near the ceiling is warmer than the air near the floor? Or that water in a pool is cooler at the deep end?
Examples: air movement in a home, pot of heating water.
Pick one of these examples and draw the circular pattern in your notes.

14. Convection Current Cool fluids sink Warm fluids rise Sink=more dense
Rise= less dense
Warm fluids rise

15. RADIATION Radiation is the transfer of energy by electromagnetic waves
Radiation does NOT require matter to transfer thermal energy
Radiation = Radiates (heat escaping the sun)

16. Radiation May Come From Other Sources
Have you ever sat too close to a campfire while cooking marshmallows? You’re enjoying the warmth ….. only to notice that your skin is really warm?

17. Examples of RADIATION
Fire
Heat Lamps
Sun

18. 1. Which of the following is not a method of heat transfer?
A. Radiation
B. Insulation
C. Conduction
D. Convection

19. 3. How does heat energy reach the Earth from the Sun?
A. Radiation
B. Conduction
C. Convection
D. Insulation

20. 3 Ways Energy (Heat) is Transferred
*Transfer of heat (energy) that happens when molecules bump into each other
*Objects must be touching
*”Conduction is touchin’”
*Transferred in rays or waves
*Energy from the Sun warms the Earth
*Transfer of heat by the flow of material
*In warm air, the molecules move apart, so it is less dense and rises
*In cooler air, the molecules move closer together, so it is more dense and sinks
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21. Your foldable should be complete
Tape it into your notebook, be sure you can open it!