1. Conduction Convection & Radiation
Heat Transfer
Conduction Convection & Radiation

2. WARM-UP: 03/14
Write today’s date and write the following information on your paper…
ESSENTIAL QUESTIONS: How does heat travel? What are the effects of heat transfer? What are the similarities and differences between convection, radiation, and conduction?
Objective: Students will understand that conduction, radiation and convection are methods of heat transfer, and that heat energy will travel in the direction of warmer to cooler temperatures.

3. Video Clip from Discovery Education
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Questions:
What is a conductor? What is an insulator?
What kind of heat transfer made the part of the nail that was not in the fire get hot?

4. Then you have witnessed heat, but how would you define it??
What is Heat?
Ever feel the warmth from a fire?
Touch a hot iron and burn yourself?
Watch water boil on the stove?
Then you have witnessed heat, but how would you define it??

5. What is Heat? Temperature is a
Heat is the movement of energy from a warm object to a cool object.
Energy passes through atoms
Temperature is a
measure of how much energy
is in an object.

6. What is Heat? HOOK Try this… Rub your hands together for 30 seconds.
Now touch them to your ears.
Can you feel the heat transfer from your hands to your ears?
As your ear warms, your hands will cool down until the particles in each reach the same speed.

7. How Does Heat Move? Heat moves through objects in three main ways:
1. Conduction
2. Convection
3. Radiation

8. Conduction
When heat energy passes from one object to another when they touch
Example:
If you hold an ice cube in your hand the ice cube melts.
The heat energy passes from your hand to the ice.

9. Conductors
Some materials like to pass heat energy through them and do it easily.
These materials are called conductors
Metal and glass are two examples of conductors
(You definitely don’t want to touch a metal pan when it’s on the stove!)

10. Insulators
Materials that do not transfer heat energy easily or it may take longer for the heat to pass through them.
Foam and plastic are both good insulators
Example: plastic is normally used
for coolers to keep heat from
entering the container
(which keeps your food cold)

11. Convection Convection deals with density.
Heat energy can travel differently through liquids and gases: Convection is the transfer of heat by the movement of a heated fluid in a circular motion…
Convection deals with density.
REMEMBER: Density is the measure of how much mass is there in a volume of a substance.
Example: Air circulating through your room, water boiling in a pot, and lava lamps are examples of convection

12. Convection
When a liquid or gas is heated, the particles move faster and the density decreases.
As the fluid becomes cooler, its density increases.
As density increases, the fluid sinks.
Heat Rises!!

13. Radiation
When heat energy does not need to travel through particles it is known as radiation.
Heat energy can travel through electromagnetic waves such as infrared, microwaves and visible light.
Example: The heat from the
sun travels by radiation

14. Look at the three images below
Look at the three images below. Identify which is an example of conduction, convection, and radiation.
A. B. C.

15. Look at the three images below
Look at the three images below. Identify which is an example of conduction, convection, and radiation.

16. Heat Transfer
Summarizer…

17. Heat Transfer
Summarizer…
Conduction
Convection
Radiation

18. Hand Boiler Toy
The body heat from your hand causes the liquid to boil, which in turn makes the liquid evaporate, turning it to gas. The expanding gas pushes the liquid upwards and when you release your hand, equilibrium is re-established. The gas condenses into a liquid again and flows back into the lower bulb.
What methods of heat transfer does this toy demonstrate? Explain.

19. Mr. Parr’s Heat Transfer Song
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20. Methods of Heat Transfer Worksheet
Complete this worksheet for extra practice…Write down these definitions at the top of your paper.
Conduction: Transfer of heat by direct contact of materials.
Convection: Transfer of heat by the movement of a fluid. A fluid can be a liquid or a gas.
Radiation: Transfer of heat through electromagnetic waves.