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Download Understanding Heat Transfers Conduction, Convection and Radiation
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Transcript
UNDERSTANDING HEAT TRANSFER: CONDUCTION, CONVECTION AND RADIATION HEAT TRANSFER •Heat always moves from a warmer place to a cooler place. •Hot objects in a cooler room will cool to room temperature. •Cold objects in a warmer room will •heat up to room temperature. HEAT TRANSFER METHODS •Heat transfers in three ways: •Conduction •Convection •Radiation CONDUCTION The transfer of heat energy from one substance to another through direct contact. Heat transfers from the warmer part of the object to the cooler part of the object CONVECTION Transfer of heat through the movement of particles. Convection occurs in liquids and gases. This occurs in a circular motion as warm particles rise and cooler particles sink. Convection Heat COLD AIR SINKS Where is the freezer compartment put in a fridge? It is put at the top, because cool air sinks, so it cools the food on the way down. Freezer compartment It is warmer at the bottom, so this warmer air rises and a convection current is set up. RADIATION •Energy that travels across distances as certain types of waves.
