Types of Heat Transfer 1. Heat The movement of thermal energy from one place to another due to a...

Types of Heat Transfer

1

Heat• The movement of thermal

energy from one place to another due to a difference in temperature.

• In other words, heat travels from a hot area towards a cold area.

2

On page 7 of your Interactive Notebook, draw the

demonstration with food coloring and hot a cold water.

• In which beaker is the food coloring spreading out the fastest?

• Why does the food coloring spread out faster in one beaker than the other?

• Beneath your diagram, describe what happened.

3

• The movement of heat by invisible waves, so one can feel the heat without touching the object.

4

Radiation

• Takes place in fluids such as liquids or air.

• Occurs when hot air or liquid rises and cold air or liquid moves in to take its place.

5

Convection

• Takes place when heat moves from one area of an object to another area of the object without the object itself moving.

6

Conduction

Types of Heat Transfer

•Conduction•Convection•Radiation

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Examples of conduction

• A spoon being heated up while in a bowl of soup.

• A car engine heating up.• Your butt warming up the seat of your chair.

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Which objects make good conductors of heat?

•Metals•Glass

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Which objects make poor conductors of heat?

•Styrofoam•Wood•Air and fluids

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Examples of radiation

• Heat from the sun warming your body.

• Heat from a fire warming your hands.

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Examples of convection

• Heating up a pot of soup.• Warm air coming out of the vent in

your house and heating up your room.

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Heat transfer animation

• http://www.wisc-online.com/objects/index_tj.asp?objid=SCE304

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Since heat moves from place to place, heat in the atmosphere moves around on the Earth.

This causes changes in weather.

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Convection currents

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Ever notice how it is hotter upstairs than downstairs?Ever wonder why hot air

balloons float?

It is because hot air rises.

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Convection in our atmosphere

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Radiation

Exit Ticket-Heating the Atmosphere

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C.

B.

Adapted from: Prentice Hall: Science Explorer, Weather and Climate