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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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PowerPoint Slideshow about ' Heat Transfer' - dara-dodson


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Presentation Transcript
slide2
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?
slide5
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.
the first method of heat transfer
The first method of heat transfer

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

RADIATION

?

slide9
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?

slide12
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

slide13
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?

slide16
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.

slide17
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

slide22
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.

slide23
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.

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