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Heat Transfer

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Page 1: Heat Transfer. Heat transfer Everything is made of molecules. When molecules gain energy they move faster and create more heat. (The faster the molecules

Heat Transfer

Page 2: Heat Transfer. Heat transfer Everything is made of molecules. When molecules gain energy they move faster and create more heat. (The faster the molecules

• Heat transfer

• Everything is made of molecules. • When molecules gain energy they

move faster and create more heat.

• (The faster the molecules move the hotter they are)

Melting Evaporation

CondensationFreezing

liquidSolid Gas

Molecules move very slowly! They are close together.

Molecules move faster and are more spread apart.

Molecules move very fast! They are very spread apart.

Page 3: Heat Transfer. Heat transfer Everything is made of molecules. When molecules gain energy they move faster and create more heat. (The faster the molecules
Page 4: Heat Transfer. Heat transfer Everything is made of molecules. When molecules gain energy they move faster and create more heat. (The faster the molecules

• Heat • Is the transfer of thermal energy from a hotter object to a cooler one until both objects are the same temperature.

(You can not transfer cold or give someone cold)

heat transfer video clip

Page 5: Heat Transfer. Heat transfer Everything is made of molecules. When molecules gain energy they move faster and create more heat. (The faster the molecules

On a hot sunny day, have you ever seen cars, buildings, or other objects appear to shimmer or waver on the other side of a

street or parking lot?

• Explanation: Sun is heating up the ground more quickly than it heats the air, especially if the surface of the ground is a dark color. The heated air rises and bends light waves as it passes through them. Making the objects on the other side shimmer.

Page 6: Heat Transfer. Heat transfer Everything is made of molecules. When molecules gain energy they move faster and create more heat. (The faster the molecules

3 ways that heat is transferred within the

atmosphere

•Radiation•Conduction •Convection

Page 7: Heat Transfer. Heat transfer Everything is made of molecules. When molecules gain energy they move faster and create more heat. (The faster the molecules

The first method of heat transfer

How does heat energy get from the Sun to the Earth?

?RADIATION

Page 8: Heat Transfer. Heat transfer Everything is made of molecules. When molecules gain energy they move faster and create more heat. (The faster the molecules

• Radiation

What createselectromagnetic

waves?

Video clip 1video clip 2Eureka start at 2:30

• The direct transfer of energy by infrared electromagnetic Waves.

• Sun, fire, light bulbs

Page 9: Heat Transfer. Heat transfer Everything is made of molecules. When molecules gain energy they move faster and create more heat. (The faster the molecules
http://images.google.com/imgres?imgurl=http://classroomclipart.com/images/gallery/Animations/lightbulb.gif&imgrefurl=http://classroomclipart.com/cgi-bin/kids/imageFolio.cgi%3Faction%3Dview%26link%3DAnimations%26image%3Dlightbulb.gif%26img%3D12%26tt%3D&usg=__LlKd2Cp69Zn0WFuNjHP-pc_YVXI=&h=624&w=450&sz=47&hl=en&start=17&tbnid=FGuw75BrL0waoM:&tbnh=136&tbnw=98&prev=/images%3Fq%3Dlightbulb%26hl%3Den%26rlz%3D1T4ADBS_enUS312US313
Page 10: Heat Transfer. Heat transfer Everything is made of molecules. When molecules gain energy they move faster and create more heat. (The faster the molecules

Pair Share

• Partner A: What is radiation and where does it come from.

• Partner B: What are three different things that create electromagnetic radiation?

Page 11: Heat Transfer. Heat transfer Everything is made of molecules. When molecules gain energy they move faster and create more heat. (The faster the molecules

•Conduction

•conduction video clip 1

•Eureka

• The direct transfer of heat from one substance to another substance that is touching.

That’s Hot

Ironing Clothes

Stepping on hot sand.

Objects have to touch!!!

Page 12: Heat Transfer. Heat transfer Everything is made of molecules. When molecules gain energy they move faster and create more heat. (The faster the molecules

ConductionWhen you heat a metal strip at one end, the heat travels to the other end.

As you heat the metal, the particles vibrate, these vibrations make the adjacent particles vibrate, and so on and so on, the vibrations are passed along the metal and so is the heat. We call this?

Page 13: Heat Transfer. Heat transfer Everything is made of molecules. When molecules gain energy they move faster and create more heat. (The faster the molecules

Conduction Example

• Stir your hot soup with a metal spoon• Pretty soon you need a pot holder

because the end of the spoon you are holding gets hot

• This is heat transfer by conduction• Energy travels up the spoon from the

end in the hot soup to the end in your hand

Page 14: Heat Transfer. Heat transfer Everything is made of molecules. When molecules gain energy they move faster and create more heat. (The faster the molecules

Example of Conduction

Page 15: Heat Transfer. Heat transfer Everything is made of molecules. When molecules gain energy they move faster and create more heat. (The faster the molecules

Pair Share: Partner A: Using the

picture on the right explain the conduction process

Pair Share: Partner B: Explain how the

picture on the left is conducting heat.

Page 16: Heat Transfer. Heat transfer Everything is made of molecules. When molecules gain energy they move faster and create more heat. (The faster the molecules

• Convection

• convection video clip

• Convection 2

• Convection- Eureka

• The transfer of heat by movement of a fluid (liquids and gases).

OVEN

Dryer

Cooking peas in water

Blow Drying your Hair.

Page 17: Heat Transfer. Heat transfer Everything is made of molecules. When molecules gain energy they move faster and create more heat. (The faster the molecules

Convection

What happens to the particles in a liquid or a gas when you heat them?

The particles spread out and become less dense.

This effects fluid movement.What is a fluid?A liquid or gas.

Page 18: Heat Transfer. Heat transfer Everything is made of molecules. When molecules gain energy they move faster and create more heat. (The faster the molecules

Water movement

Hot water rises

Cooler water sinks

Convection current

Cools at the surface

Page 19: Heat Transfer. Heat transfer Everything is made of molecules. When molecules gain energy they move faster and create more heat. (The faster the molecules
Page 20: Heat Transfer. Heat transfer Everything is made of molecules. When molecules gain energy they move faster and create more heat. (The faster the molecules

Freezer compartment

It is put at the top, because cool air sinks, so it cools the food on the

way down.

It is warmer at the bottom, so this warmer air

rises and a convection

current is set up.

Why do most refrigerators have the freezer on top. Hint think about the principle of convection.

Page 21: Heat Transfer. Heat transfer Everything is made of molecules. When molecules gain energy they move faster and create more heat. (The faster the molecules
Page 22: Heat Transfer. Heat transfer Everything is made of molecules. When molecules gain energy they move faster and create more heat. (The faster the molecules

Conduction, Convection and Radiation

Page 23: Heat Transfer. Heat transfer Everything is made of molecules. When molecules gain energy they move faster and create more heat. (The faster the molecules
Page 24: Heat Transfer. Heat transfer Everything is made of molecules. When molecules gain energy they move faster and create more heat. (The faster the molecules

• Heating the troposphere

• Radiation, conduction and convection work together to heat the troposphere.

• Radiation- heats the Earth • Conduction- Air near earth’s

surface is warmed• Convection- the warm air

molecules rise and transfer heat to the cooler air molecules. Eventually these molecules cool and sink back down to earth. This creates Convection Currents.

Page 25: Heat Transfer. Heat transfer Everything is made of molecules. When molecules gain energy they move faster and create more heat. (The faster the molecules

Radiation

Radiation, Convection and Conduction work together to heat the troposphere.

review of all 3 types

Conduction

Convection Current

Page 26: Heat Transfer. Heat transfer Everything is made of molecules. When molecules gain energy they move faster and create more heat. (The faster the molecules

Radiation, Convection and Conduction work together to heat the troposphere.

Page 27: Heat Transfer. Heat transfer Everything is made of molecules. When molecules gain energy they move faster and create more heat. (The faster the molecules

ReviewHeat transfer from a hotter object to a cooler

object until both objects are the same temperature.

3 types of heat transfer review, review 2Music Review• Radiation – electromagnetic waves• Conduction – touching• Convection- through a fluid (liquid or gas)• All 3 work together to heat the troposphere

but Convection causes most of the heating.


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