heat transfer
Post on 22-Sep-2014
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What happens when you hold chocolate in your hand?
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It melts!
• WHY?
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• Heat always moves from HOT to COLD. hotcold
HOT HEAT COLD
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HEAT
37°C
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Vocabulary
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Conduction
• Conduction is the transfer of heat within a substance by direct particle to particle contact.
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Conduction
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• -the transfer of heat by the movement of a liquid or gas.
Smoke Smoke
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Convection
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Radiation
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Review
• Heat _______ moves from ____ to _____.
HOT HEAT COLD
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REVIEW!Conduction, Convection, or Radiation?• What type of heat transfer is by particles
touching? Conduction
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REVIEW!Conduction, Convection, or Radiation?• Sea breeze
Convection
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REVIEW!Conduction, Convection, or Radiation?• Heat we feel from the sun is ____________?Radiation
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REVIEW!Conduction, Convection, or Radiation?
Conduction
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REVIEW!Conduction, Convection, or Radiation?
Radiation
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REVIEW!Conduction, Convection, or Radiation?
Convection
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A.A.B.B.
C.C.C.C.
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REVIEW!Conduction, Convection, or
Radiation?
Heater
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Conduction
• Most metals are good conductors of heat– Copper, brass, iron
Bad conductors of heat are called insulators- corkboard, styrofoam, air
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Radiation
• Different objects absorb and radiate heat differently.
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Radiation
• How a body radiates heat• 1. Nature of the surface– Black/white, rough/smooth, shiny/dull• Black, rough surfaces are better able to radiate heat.
2.Total Surface area- Larger area radiates more heat2.Temperature -hotter things radiate more heat