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HEAT TRANSFER: CONDUCTION PowerPoint PPT Presentation


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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 l.jpg

HEAT TRANSFER: CONDUCTION

DUNMAN SECONDARY SCHOOL

Science (Physics)


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Some Expectations

  • Respect Others

  • Respect the School

  • Humility


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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!


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Why learn heat transfer?

  • Many applications in real life.

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


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SOLDIER OF TOMORROW

  • Soldier suits can regulate temperature!!


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CHALLENGE!!

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


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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.


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CONDUCTION

can occur by

Molecular Vibration

Free Electron Diffusion


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Molecular Vibration

  • Demonstration of molecular vibration.

  • What do you observe about the rate of transfer?

  • A slow process…


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Test Your Understanding

  • Why are gases and liquids generally poor conductors of heat?

http://www.cartoonclipart.com/pages/girlread.html


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Insulators and Conductors

  • Poor conductors are also called insulators.

    Some examples: Water, Wood, Polystyrene.


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Free Electron Transfer

  • METALS contain many free electrons.

  • See Demostration

  • Rate of heat transfer is now faster. Why?


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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.


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Test Your Understanding

  • Why is copper a better conductor of heat than wood?


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Your research

  • What are some applications of:

    • Conductors

    • Insulators

      in everyday life? (Choose one)

  • Do in groups of two or three.


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Your Research

  • Presentation format – YOU DECIDE

    • Concept Maps with Pictures?

    • Short video? (Takes a long time… but if you can… why not?)

    • Research Paper?? (you sure???)

  • The point is: BE INNOVATIVE

  • Dateline: 20 Mar 2006 (Mon) 1300 hrs


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What we have learnt…

  • The main process by which thermal energy is transferred from one end of a solid to another is conduction.

  • Two mechanisms of conduction:

    • Molecular vibration

    • Free electron diffusion

Done by: Chew Yiming Clement


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