chapter11.5_slides

chapter11.5_slides - 11/15/2009 Heat is defined as energy...

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11/15/2009 1 Heat is defined as energy transferred between systems Methods of energy transfer include Conduction Convection Radiation conduction Thermal Energy is transferred by contact - From high T object to low T object - Or from the high T side to the low T side of the same object Rate of conduction depends upon the characteristics of the substance Most cooking pans use plastic or wood handles instead of metal ones metals conduct thermal energy better than wood/plastic low T Q High T
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11/15/2009 2 Atoms vibrate about their equilibrium positions The higher the T, the greater the vibration amplitude Atoms near the stove coil vibrate with larger amplitudes They collide with adjacent atoms and transfer some energy, increasing the latter’s vibration amplitude and T Supposed two sides of a slab are fixed at different temperature, T h (hot), and T c (cold) For a slab, the rate of thermal conduction t Q P area) sectional - (cross A ) difference re (Temperatu ) ( c h T T L ) thinkness to al proportion inversely ( 1 L
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11/15/2009 3 For a slab, the rate of thermal conduction The proportional constant, k , is called thermal conductivity of the substance Unit of
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chapter11.5_slides - 11/15/2009 Heat is defined as energy...

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