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Types of Heat Transfer
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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.
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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.
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• The movement of heat by invisible waves, so one can feel the heat without touching the object.
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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.
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Convection
• Takes place when heat moves from one area of an object to another area of the object without the object itself moving.
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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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A.
C.
B.
Adapted from: Prentice Hall: Science Explorer, Weather and Climate
