Thermal Energy Conduction Convection and Radiation How Heat

Thermal Energy Conduction, Convection and Radiation

How Heat Travels • Heat moves from warmer ____ matter to cooler matter. ____ • Heat moves in 3 different ways: Conduction • _____ Convection • _____ Radiation • _____

Conduction • Definition: heat The transfer of _____ through a direct contact material by ______. • Examples: • 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 freemoving electrons, and in other substances through moving atoms.

Convection • Definition: fluid The transfer of heat in a _____ (gas or liquid) as a result of the movement _______ of the fluid itself. • Examples: • 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 electromagnetic waves _________ space through ______. • Examples: • The heat from the sun melting ice cream. • The heat from a campfire.

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