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6.2 Transferring Thermal Energy. Conduction. Transfer of thermal energy (TE) by collisions between the particles in matter Kinetic energy is transferred when faster moving particles bump into slower moving particles
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Conduction • Transfer of thermal energy (TE) by collisions between the particles in matter • Kinetic energy is transferred when faster moving particles bump into slower moving particles • This can happen in solids, liquids and gases, but since solid’s particles are closer together, solids are able to conduct heat better than liquids and gases
Convection • Transfer of E by the movement of matter • Liquids and gases can flow , so their particles can move from one place to another, carrying E with them • When heating a liquid a convection current forms, rises, then cools and sinks
Radiation • Transfer of E by electromagnetic waves • Does NOT require matter for heat transfer • How the sun warms the Earth from 150 million Kilometers away! • Called radiant E • 34% reflects back into space • Only RE that is absorbed changes into thermal E • Different materials absorb RE differently: Shiny: reflects • Dull: absorbs • Dark colors absorb more than light colors