HEAT TRANSFER: CONDUCTION

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HEAT TRANSFER: CONDUCTION. DUNMAN SECONDARY SCHOOL Science (Physics). Some Expectations. Respect Others Respect the School Humility. Work Ethic. DO participate and ask questions. For order in class, raise your hand when asking a question. BRING all specified books.

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## HEAT TRANSFER: CONDUCTION

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### HEAT TRANSFER: CONDUCTION

DUNMAN SECONDARY SCHOOL

Science (Physics)

Some Expectations
• Respect Others
• Respect the School
• Humility
Work Ethic
• DO participate and ask questions. For order in class, raise your hand when asking a question.
• BRING all specified books.
• HAND IN all homework ON TIME! Failure to do so may result in consequences… (“Drink coffee” with Mr. Chew after school)
• SHOW CARE and concern for each other. Help one another in homework. BUT NO COPYING OF ENTIRE ASSIGNMENTS!
Why learn heat transfer?
• Many applications in real life.

Example: Making of engines, refrigerators, air cooling systems…

SOLDIER OF TOMORROW
• Soldier suits can regulate temperature!!

CHALLENGE!!

How do you place a piece of paper over a candle flame without the paper catching fire?

CONDUCTION
• Conduction is the transfer of thermal energy without any flow of the material medium.
• This is the main process by which thermal energy is transferred from one of the solid to another.

CONDUCTION

can occur by

Molecular Vibration

Free Electron Diffusion

Molecular Vibration
• Demonstration of molecular vibration.
• What do you observe about the rate of transfer?
• A slow process…
• Why are gases and liquids generally poor conductors of heat?

Insulators and Conductors
• Poor conductors are also called insulators.

Some examples: Water, Wood, Polystyrene.

Free Electron Transfer
• METALS contain many free electrons.
• See Demostration
• Rate of heat transfer is now faster. Why?
Free Electron Diffusion
• When heated, the free electrons move faster and diffuse to into the cooler parts of the metal.
• Kinetic energy is then transferred to the molecules by collision.
• Why is copper a better conductor of heat than wood?
• What are some applications of:
• Conductors
• Insulators

in everyday life? (Choose one)

• Do in groups of two or three.