1 Temperature and Heat Temperature is the measurement of the avg. KE of the molecules in a material. Heat is the transfer of KE from one material to.

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Presentation transcript:

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Temperature and Heat Temperature is the measurement of the avg. KE of the molecules in a material. Heat is the transfer of KE from one material to another. Clip 3

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Conduction The transfer of thermal energy in solids. Materials must be in direct contact with each other! Ex: Heating of the bottom of a pot on stove. Clip 6

Convection Transfer of thermal energy in liquids and gases.Transfer of thermal energy in liquids and gases. The matter actually moves from one place to another.The matter actually moves from one place to another. clip 7

Radiation Transfer of thermal energy by electromagnetic waves (well discuses these more later)Transfer of thermal energy by electromagnetic waves (well discuses these more later) Transferring energy through space... NO MATTER IS REQUIRED!Transferring energy through space... NO MATTER IS REQUIRED! ClipClipClip 8

Specific Heat Adding Energy to a material Causes the Temperature to go up. Taking energy away from a substance causes the temp. to Go down! 10

Have you ever noticed that on a hot summer day the pool is cooler than the hot cement? OR maybe that the ocean is cooler than the hot sand? Why? The sun has been beating down on both of them for the same amount of time It takes more thermal energy to raise the temperature of water that it does the cement! 11

Water absorbs a lot of heat energy before its temperature changes while sand needs little heat energy before its temperature increases. 12

Specific Heat The amount of energy required to raise the temperature of a material (substance). It takes different amts of energy to make the same temp change in different substances. We call the amt required: Specific Heat! 15

Specific Heat of water The specific heat is high because H 2 O molecules form strong bonds w/each other. It takes a lot of energy to break the bonds so that the molecules can then start to move around faster (HEAT UP). 16