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

2. WARM-UP
Write today’s date and write the following information in your notebook/binder…
ESSENTIAL QUESTIONS: How does heat travel? What are the effects of heat transfer? What are the similarities and differences between convection, radiation, and conduction?
STANDARD: 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?
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. How Does Heat Move? Heat moves through objects in three main ways:
1. Conduction
2. Convection
3. Radiation

7. Conduction Transfer of heat through direct contact
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.

8. 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!)

9. Insulators
Other materials do not transfer heat energy easily or it make take longer for the heat to pass through.
Foam and plastic are both good insulators
Example: wall insulation keeps the \
house warm, fur and fluff in our coats,
Material gloves and hat are made of etc., thermos, or coolers.

10. Convection Convection deals with density.
The transfer of heat through liquids and gases. Hot fluids rise, cool fluids sink.
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

11. 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!!

12. Radiation
The transfer of heat without direct contact (indirect contact). Transfer of heat through empty space.
Heat energy can travel through electromagnetic waves such as infrared, microwaves and visible light.
Example: The heat from the
sun travels by radiation