Heat Notes  Expansion – _______ ___________________  Contraction – ______ _______________________  Most materials ________ when heated and _______ when cooled –Exceptions: water expands when it freezes, certain plastics

Heat Notes  Materials expand because heat increases _________ energy. The atoms and molecules bounce around more, knocking each other _______________. –Example: A thermometer works because alcohol expands when it is heated causing it to rise higher in the thermometer when it is hot.

Heat Notes - Energy  Energy is the ability to do ________  Energy can change ____. All energy can change into ______.  Potential energy – energy due to an object’s ______  Kinetic energy – energy of _________

Heat Notes - Temperature  All matter is made up of ______ that are in motion.  Temperature - ______ _________ of an object  Thermometer – measures temperature________

Heat Notes  Heat – amount of __________________ transferred from one object to another  Heat moves from ___ ____________  Calorimeter – used to measure _________

Heat Notes – Heat Transfer  Three ways to transfer heat: ______________

Heat Notes – Convection  Transfer of heat through a _________ _________ due to the fact that hot air is less dense than cool air –Hot air rises, spreads out, cools off and sinks –Examples: water boiling, currents in the mantle of the Earth, air in a room

Heat Notes - Radiation  Transfer of heat in ________________ –Colors that absorb radiation = ________ ___________________ –Colors that do not absorb radiation = ________________

Heat Notes - Conduction  Transfer of heat through _______ ____________ - Heat is transferred ______ by a conductor –Heat is transferred ______ by an insulator

Heat Notes - Conduction  Insulate – a material that does not conduct heat well –Examples: _________ ____________________

Heat Notes - Conduction  Conduct – a substance through which electrons move freely, transmitting heat or electricity –Examples: _________ ____________________