Thermal Energy Conduction, Convection and Radiation.

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Presentation transcript:

Thermal Energy Conduction, Convection and Radiation

How Heat Travels warmer cooler Conduction Convection Radiation Heat moves from ________ matter to ________ matter. Heat moves in 3 different ways: __________ warmer cooler Conduction Convection Radiation

Conduction heat direct contact Definition: The transfer of __________ through a material by ___________ __________. Examples: heat direct contact A metal spoon gets hot quickly in hot cocoa An iron heats up the material it comes in contact with.

Heat transfer by Conduction Note that in metals, heat is transferred through free-moving electrons, and in other substances through moving atoms. *images from http://www.bbc.co.uk/schools/gcsebitesize/science/aqa/energy/heatrev1.shtml

Convection fluid movement Definition: The transfer of heat in a __________ (gas or liquid) as a result of the ______________ of the fluid itself. Examples: fluid movement Boiling pasta in water. Wind currents.

Heat transfer by Convection Note that the warm material rises, cools at the surface and then sinks in a circular pattern. *animation from http://commons.wikimedia.org/wiki/File:Convection.gif

Radiation electromagnetic waves space Definition: The transfer of heat via __________________ _________ through ___________ . Examples: electromagnetic waves space The heat from the sun melting ice cream. The heat from a campfire.

Review All Three B. A. C.

Animations of Conduction, Convection and Radiation Teacher's Domain Animations Movie of convection in the sun Effect of heat on atoms BrainPop – Heat BrainPop - Heat Quiz