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WELCOME BACK MINIONSTime to check workbooks!
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REVIEW
Let’s grade our
“Take Home Quiz”.
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SO HOW IS HEAT TRANSFERRED?
•3 Methods:•Conduction•Convection•Radiation
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1ST ENERGY TRANSFER SCENARIO…
• You are making Mac & Cheese on the stove.• You leave a metal
spoon in the pot for a few minutes while you leave the room.• You come back to stir
the Mac & Cheese and grab the spoon…
• What happens?
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CONDUCTION!!!• Conduction- Heat
transferred from one particle of matter to another without the movement of the matter.
• The hot pot’s fast moving particles collide with the slow moving particles of the cooler spoon.• As the particles move
faster, the spoon becomes hotter!
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EXAMPLES…
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2ND ENERGY TRANSFER SCENARIO…•More cooking!
• You have a pot of water on the stove.
•What is happening to the water?•What is the motion of the water?
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CONVECTION!!!• Convection- Heat is
transferred by the movements of current within a gas or liquid.
• The heated water from the bottom of the pot rises to the top.• Cooler water at the top
sinks to the bottom.• This flow creates a circular
motion called a Convection Current.
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EXAMPLES…
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3RD ENERGY TRANSFER SCENARIO…
• The house is cold and the power goes out!!!
•Use the fireplace!
•How are the burning logs warming the house?
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RADIATION!!!• Radiation- The transfer of energy by electromagnetic waves.
• Think of the sun.• On a cool day, stand in the shade… •…then stand in the sunlight!• You are being heated by the sun’s radiation!
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EXAMPLES…
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HEAT TRANSFER…Heat can be transferred in three ways.
Conduction– transfer of heat between particles without the movement of matter
Convection– transfer of heat by the movement of currents in a fluid
Radiation– transfer ofenergy by electromagnetic waves
- The Transfer of Heat
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- The Transfer of Heat
HEAT MOVES ONE WAY
• If two objects have different temperatures, heat will flow from the warmer object to the colder one.
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HOW WELL DOES A MATERIAL TRANSFER HEAT?
• On a cold morning, step from a rug to a tile floor…
• Rug feels comfy to the feet… • Tile is COLD!!!
• What is going on?
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CONDUCTORS & INSULATORS
• Conductor- Material that conducts heat well.• What can you think of that is a good conductor?
• Metals, tile, and the like…
• Insulator- Material that does NOT conduct heat well.• What can you think of that is a good insulator?
• Wool, wood, straw, paper and the like…
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- The Transfer of Heat
INSULATORS
• Air between the panes of this window acts as an insulator to slow the transfer of heat.
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CLOSING…
•Give me an example of:• Conduction• Convection• Radiation
•Give me an example of:• Conductor• Insulator