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Thermal EnergyConduction, Convection and Radiation

How Heat Travels

• Heat moves from ________ matter to

________ matter.

• Heat moves in 3 different ways:

• __________

• __________

• __________

warmercooler

ConductionConvectionRadiation

Conduction

• Definition:

The transfer of __________

through a material by ___________

__________.

• Examples:•

•

direct contactheat

A metal spoon gets hot quickly in hot cocoaAn 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

• Definition:The transfer of heat in a __________ (gas or liquid) as a result of the ______________ of the fluid itself.

• Examples:•

•

movement

fluid

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

• Definition:The transfer of heat via __________________ _________ through ___________ .

• Examples:•

•

waveselectromagnetic

The heat from the sun melting ice cream.

The heat from a campfire.

space

Review All Three

A. B.

C.

Animations of Conduction, Convection and Radiation

• Teacher's Domain Animations

• Movie of convection in the sun

• Effect of heat on atoms