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Transmission of Heat

A presentation on the two modes of transmission of heat; conduction and convection.
by

Leow Guan

on 27 August 2009

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Transcript of Transmission of Heat

Transmission of Heat
Part 2
Conduction
Thermal Conductors
heat transfer through a medium or material without any movement of the medium or material
Materials that conduct heat more rapidly than others are called thermal conductors
Most metals are good thermal conductors
Examples of Thermal Conductors
Insulators
Poor heat conductors are called insulators
They conduct heat much more slowly
examples of insulators: wood, rubber, asbestos, plastic, glass, water, air and....
vacuum
Application
cooking utensils
Application of conductors
Boilers in a factory or power station have to rapidly convert heat to steam
Radiators have to conduct heat from a hot source before they can warm the air around them.
Thermal insulators are good at keeping heat out AND keeping heat in.
winter scarf
Insulated wall
handles of cooking utensils
Convection
Convection is the transfer of heat from one place to another by the movement of currents in liquids or gases
Application
electric kettle
refrigerator
grill
Metal grill is heated, which in turn heats the food and the surrounding air inside the grill
The hood traps the heated air inside, which increases the temperature inside the grill
Full transcript