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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Radiation
• The movement of heat by invisible waves, so
one can feel the heat without touching the
object.
4
Convection
• 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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Conduction
• 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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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.wisconline.com/objects/index_tj.asp?objid=SC
E304
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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
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Exit Ticket-Heating the Atmosphere
A.
B.
C.
Adapted from: Prentice Hall: Science Explorer, Weather and Climate
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