TOPIC: Heat AIM: How is heat transferred?

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Presentation transcript:

TOPIC: Heat AIM: How is heat transferred?

Movement of heat from warm  cool object What is heat transfer? Movement of heat from warm  cool object Example = hot pan Heat moves from pan  handle

3 types of heat transfer

Heat transfer in SOLIDS 1. Conduction Heat transfer in SOLIDS

Heat transfer by the direct contact of molecules

Fast moving molecules (have more heat)  Bump into slower ones  Start to move faster  collide with other slower molecules…

Why can the girl on the right toast marshmallows without getting burned?

Conductor Material that allows heat to move through it easily Metals (copper & silver are the best)

Example: copper pipes (Heat exchangers in hot water tanks, under floor heating systems, and car radiators)

TOPIC: Heat AIM: How is heat transferred? Cont’d…

Do not conduct heat easily Insulators Do not conduct heat easily Wood, paper, wax, air, house insulation, plastic

Transfer of heat in liquids & gases Liquid heated  molecules move faster & farther apart less dense  rise carrying heat with it 2. Convection

Example: warm air rises, cool air sinks

Up & down movement of molecules due to changes in density Convection currents Up & down movement of molecules due to changes in density

Convection Currents Inside the Earth

3. Radiation Heat transfer through space Can travel when no matter is present (vacuum) Heat energy from sun, stars, fire

Radiation from the Sun travels through empty space.

Radiation from the fire heats the marshmallow.

SOLIDS LIQUIDS & GASES THROUGH SPACE

REVIEW C conduction B convection A radiation

REVIEW A convection B radiation conduction D C convection

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