heat transfer

What happens when you hold chocolate in your hand?

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What happens when you hold chocolate in your hand?

It melts!

• WHY?

• Heat always moves from HOT to COLD. hotcold

HOT HEAT COLD

HEAT

37°C

Vocabulary

Conduction

• Conduction is the transfer of heat within a substance by direct particle to particle contact.

Conduction

• -the transfer of heat by the movement of a liquid or gas.

Smoke Smoke

Convection

Radiation

Review

• Heat _______ moves from ____ to _____.

HOT HEAT COLD

REVIEW!Conduction, Convection, or Radiation?• What type of heat transfer is by particles

touching? Conduction

REVIEW!Conduction, Convection, or Radiation?• Sea breeze

Convection

REVIEW!Conduction, Convection, or Radiation?• Heat we feel from the sun is ____________?Radiation

REVIEW!Conduction, Convection, or Radiation?

Conduction

REVIEW!Conduction, Convection, or Radiation?

Radiation

REVIEW!Conduction, Convection, or Radiation?

Convection

A.A.B.B.

C.C.C.C.

REVIEW!Conduction, Convection, or

Radiation?

Heater

Conduction

• Most metals are good conductors of heat– Copper, brass, iron

Bad conductors of heat are called insulators- corkboard, styrofoam, air

Radiation

• Different objects absorb and radiate heat differently.

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

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