Heat Energy The Average Kinetic Energy in an object is temperature

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Presentation transcript:

Heat Energy The Average Kinetic Energy in an object is temperature Produced by vibrating molecules.

Background All matter is made of moving particles Heat added – molecules move faster Heat removed – molecules slow down.

Expansion and Contraction When an object loses heat it contracts When an object gains heat is expands. In thermometers, Alcohol or mercury expands and contracts.

Water the Exception Water is the only substance that expands when it freezes. Powerful enough to break glass and crack rocks. This is called frost action

Heat Transfer Heat travels from areas of high temperature to areas of low temperature. 3 ways – Conduction, convection, and radiation.

Conduction The transfer of heat by direct contact. Ex. Metal spoon in a cup of hot tea. The spoon quickly becomes hot by direct contact. Materials that do not transfer heat are called insulators.

Convection Transfer of heat by flowing action Hot air rises, cold air sinks. This is called a convection current.

Radiation Transfer of heat through space in a form of waves. Ex. Heat from the sun Ex. Heat from a light bulb