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Sizzling physics
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Thursday, September 4, 2008 @ 2:33 AM
Thermal energy can be transferred by:
-conduction
-convection
-radiation
no net flow of thermal energy between 2 objects=thermal equilibrium
Conduction
Thermal energy can move through a substance by conduction.
As a heated substance,the particles within gain more energy and vibrate vigorously.Thus colliding into the other particles causing them to vibrate resulting that the heat is transferred to the neighbouring particles.
The 2 processes of transferring thermal energy from the hot to the cold end which occurs in metals and non metals=
-Atomic vibrations
-molecular vibrations
Convection
It is the transfer of thermal energy by means of current in a LIQUID or GAS only.
it is caused by the density change in the various parts of the liquid.
Radiation
it is the continuous emission of infrared waves which does not require a medium to travel from one point to another.This means that thermal energy transfer by radiation can even work in space, but conduction and convection cannot.
It's absorbed and emitted by all objects and surfaces which cause it to have an increase in temperature and a drop in temperature respectively.
Factors affecting rate of radiation
->surface area
->surface temperature
->colour and texture of surface
COMMON APPLICATIONS
-Convection-
1.electric kettles
2.household hot water system
-Radiation-
1.greenhouse
2.vacuum flasks
-conduction-
1.cooking utensils
2.table mats
wao!!this is the end of Transfer of Thermal energy!!I'm feeling the heat!!haha:)
