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Unit 8 - Transfer Of Thermal Energy

Introduction :D
Thermal Energy always flow from a region of higher temperature to a region of lower temperature. You can relate it to geography too: Hot air rises, Cold air sinks.
The SI Unit of heat energy is joules (J).

Objectives:
  1. Understand Convection, Conduction & Radiation
  2. Learn about applications of Thermal Energy Transfer


Videos speak a thousands words.
Personally, I like Eureka! Videos because they are really educational and engage kids easily.
Their contents are very easy to understand. So i've decided to put up a few here:




Happy Watching! :D



These pictures will help you understand Convection, Conduction & Radiation better.

Conduction - the transfer of heat as a result of the direct contact of rapidly moving atoms through a medium or from one medium to another, without movement of the media.
Metals conduct better than non-metals.

Convection - the transfer of heat by the physical movement of the heated medium itself. Convection occurs in liquids and gases but not in solids.

Radiation - the transfer of heat in the form of waves through space (vacuum).
Dull black surfaces are better than white shining ones at absorbing radiated heat.

Applications
i believe that pictures help us to learn better :D




(explanation in the diagram, written by myself :D)


Frying pans are usually made of shiny stainless steel.
They conduct heat better. :D


Cork mats are known for their insulating properties.


Thermal vacuum flasks are constructed like this to allow better conduction and convection to occur.


This cooker uses convection currents to cook food.


Such induction cookers make use of radiation to cook food.


Handphones, Televisions and microwave ovens require radiation!