topic: heat aim: how is heat transferred?. what is heat transfer? movement of heat from warm cool...
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TOPIC: HeatAIM: How is heat transferred?
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What isheattransfer?
•Movement of heat from warm cool object
•Example = hot pan
•Heat moves from pan handle
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3 types of heat transfer
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1.Conductio
n
•Heat transfer in SOLIDS
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•Heat transfer by the direct contact of molecules
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Fast moving molecules (have more heat) Bump into slower ones Start to move faster collide with other slower molecules…
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Why can the girl on the right toast marshmallows without
getting burned?
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Conductor
•Material that allows heat to move through it easily
•Metals (copper & silver are the best)
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•Example: copper pipes
(Heat exchangers in hot water tanks, under floor heating systems, and car radiators)
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TOPIC: HeatAIM: How is heat transferred? Cont’d…
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Insulators•Do not conduct heat easily
•Wood, paper, wax, air, house insulation, plastic
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2.Convectio
n
•Transfer of heat in liquids & gases
•Liquid heated molecules move faster & farther apart
•less dense rise carrying heat with it
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•Example: warm air rises, cool air sinks
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Convectioncurrents
•Up & down movement of molecules due to changes in density
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Convection Currents Inside the Earth
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3.Radiation
•Heat transfer through space
•Can travel when no matter is present (vacuum)
•Heat energy from sun, stars, fire
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Radiation from the Sun travels through empty space.
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Radiation from the fire heats the marshmallow.
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SOLIDS
LIQUIDS & GASES
THROUGH SPACE
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A
B
C
conduction
radiation
convection
REVIEW
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A
B
D
convection
radiation
conduction
REVIEW
C convection
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