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Thermal Energy ~ Heat Transfer

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Jacqueline Konich

on 26 February 2011

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Transcript of Thermal Energy ~ Heat Transfer

THERMAL ENERGY is the total kinetic energy of all the atoms in a sample of matter. Thermal energy is heat. All matter is made up of atoms. These atoms are in constant motion; therefore each atom in a sample of matter has kinetic energy. The more the atoms of a substance move around, the more heat energy the object has. CONDUCTION takes place when heat is transferred
from one substance to another by direct contact. Conduction can take place between solids, liquids, and gases. A conductor is a substance that easily conducts heat. Solids, especially metals, are the best coductors of heat and gases are the poorest conductors of heat. RADIATION occurs when energy is transported
by waves that travel through space. An example of radiation is the warmth that you feel coming from the sun.
The sun's energy travels through space as a wave in the form of sunlight. CONVECTION occurs when a hot liquid or gas moves from one region to another, carrying heat energy with it. Convection is driven by differences in density. A warmer gas or liquid is less dense than a cooler one. An example of convection is in a pan of boiling water. Hot water at the bottom of the pan becomes less dense than cold water at the top and hot water rises up as the cold water sinks, creating the rolling motions that you observe in boiling water. 3 CONVECTION RADIATION CONDUCTION Thermal energy is transferred in three ways: THERMAL ENERGY CONDUCTION CONVECTION Because of this difference in density, warm materials rise and cool materials sink. This rising and sinking motion forms a circular pattern called a convection current. RADIATION C O N D U C T I O N R A D I A T I O N C O N V E C T I O N If you touch this pan and burn yourself, you have just experienced conduction!
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