Heat transfer
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Heat Transfer PowerPoint PPT Presentation


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Heat Transfer. 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). Evaporation. Melting. Freezing. Condensation. Solid. liquid. Gas.

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Heat Transfer

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Heat transfer

Heat Transfer


Heat transfer

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)

Evaporation

Melting

Freezing

Condensation

Solid

liquid

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.


Pair share

Pair/Share

  • What happens to molecules as you add heat?

  • Are the molecules of water moving faster or slower in cold water? Why

  • Evaporation is when a Liquid turns into a ____________. Heat is __________.

  • Freezing is when a _________ turns into a ____________. Heat is _____________.

  • If the molecules are moving faster and our more spread out. Was heat added or removed?


Heat transfer

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


Pair share1

Pair/Share

  • Which direction does heat transfer?

    A. From warmer to cooler

    B. From cooler to warmer

    C. both directions

  • When you touch something cold which direction is heat being transferred? Why?

  • Explain why you feel cold when you touch something that is cold.


3 ways that heat is transferred within the atmosphere

3 ways that heat is transferred within the atmosphere

Radiation

Conduction

Convection


The first method of heat transfer

The first method of heat transfer

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

RADIATION

?


Heat transfer

Radiation

What creates

electromagnetic waves?

Video clip 1

video clip 2

Eureka start at 2:30

The direct transfer of energy by infrared electromagnetic Waves.

Sun, fire, light bulbs


Pair share2

Pair Share

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

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


Heat transfer

Conduction

conduction video clip 1

Eureka

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

Stepping on hot sand.

Ironing Clothes

That’s Hot


Heat transfer

  • demo of conduction

  • flame heating molecules


Conduction

Conduction

When 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?


Example of conduction

Example of Conduction


Heat transfer

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.


Heat transfer

Convection

convection video clip

Heat video clips\Convection2.asf

Convection- Eureka

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

Cooking peas in water

OVEN

Dryer

Blow Drying your Hair.


Water movement

Water movement

Cools at the surface

Convection current

Hot water rises

Cooler water sinks


Heat transfer

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.


Heat transfer

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

review of all 3 types

Radiation

Convection Current

Conduction


Review

Review

Heat transfer from a hotter object to a cooler object until both objects are the same temperature.

3 types of heat transfer

  • 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.


Review1

Review

Heat transfer from a hotter object to a cooler object until both objects are the same temperature.

3 types of heat transfer review, review 2

Music 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.


Heat transfer

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


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