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6.2 Transferring Thermal Energy

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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6.2 Transferring Thermal Energy

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  1. 6.2 Transferring Thermal Energy

  2. 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

  3. 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

  4. 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

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