10-2 Heat S8P2. Students will be familiar with the forms and transformations of energy. d. Describe how heat can be transferred through matter by the collisions.

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Presentation transcript:

10-2 Heat S8P2. Students will be familiar with the forms and transformations of energy. d. Describe how heat can be transferred through matter by the collisions of atoms (conduction) or through space (radiation). In a liquid or gas, currents will facilitate the transfer of heat (convection). E.Q. How is heat transferred in conduction, radiation, and convection?

Heat—energy that is transferred between objects that are different temperatures **Heat energy always moves from higher temperatures to lower temperatures until both objects are the same temperature** 25o C 45o C 10o C

Methods of heat transfer Conduction Convection Radiation

Conduction is the transfer of energy through matter from particle to particle as they touch. Transfer of heat energy from atom to atom Most effective in solids. Heat moves from warmer substances to cooler substances.

Thermal Conductor—a substance that transfers heat well Ex. copper, aluminum, gold, silver Thermal Insulator—a substance that does not transfer heat well Ex. glass, porcelain, plastic, rubber, wood, air

Convection the transfer of thermal energy by the movement of a gas or liquid (a medium). The circular motion caused by density differences that result from temperature differences are called convection currents.

Radiation the transfer of thermal energy by electromagnetic waves such as visible light and infrared waves. (See p. 636-637). This energy can be transferred through particles of matter OR empty space! Examples Energy from the sun Microwaves use radiation

Review

Review

How does heat move? Heat moves from the ____________ object to the _____________ object.

How does heat move? Heat moves from the warmer object to the cooler object.

What will be the new temperature? What happens to the temperature of two objects as heat is transferred from one to the other? The hotter object becomes ________ while the cooler object becomes ________ until both objects are the same temperature. They are said to reach equilibrium. Hot water at 70 degrees Cool water at 30 degrees What will be the new temperature?

What will be the new temperature? What happens to the temperature of two objects as heat is transferred from one to the other? The hotter object becomes cooler while the cooler object becomes warmer until both objects are the same temperature. They are said to reach equilibrium. Hot water at 70 degrees Cool water at 30 degrees What will be the new temperature? *If there are equal amounts of water, add the two cups and divide by 2.