Heat transfer conduction l.jpg
This presentation is the property of its rightful owner.
Sponsored Links
1 / 18

HEAT TRANSFER: CONDUCTION PowerPoint PPT Presentation


  • 132 Views
  • Uploaded on
  • Presentation posted in: General

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.

Download Presentation

HEAT TRANSFER: CONDUCTION

An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -

Presentation Transcript


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…


Test Your Understanding

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

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


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.


Test Your Understanding

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


Your research

  • What are some applications of:

    • Conductors

    • Insulators

      in everyday life? (Choose one)

  • Do in groups of two or three.


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


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


  • Login