Chapter06a - Atmospheric Stability Mechanical Equilibrium...

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Atmospheric Stability
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Mechanical Equilibrium Equilibrium. Definition: The body is at rest The sum of all forces acting on the body is zero.  Types of equilibrium :   Stable equilibrium : after a small  displacement the body returns to its  original   equilibrium position.    Unstable equilibrium : after a small  displacement the body  does not return  to  the original equilibrium position and moves to a  new equilibrium position. Neutral equilibrium : after a displacement  the body  remains  in the displaced position. G
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Examples of mechanical equilibrium G F
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The principle of hot air balloon flight Hot air rises in cooler air
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Adiabatic cooling/heating Ascending motion : the parcel of  air expands, does work on the rest of  the atmosphere and  cools down. Descending motion : the air  parcel compresses, work is done on the  air parcel and it  warms up . Adiabatic process no heat  is  exchanged between the air parcel and  the rest of the atmosphere
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Adiabatic lapse rates Adiabatic lapse rate : the rate of change  of the temperature of a rising (sinking) air  parcel with altitude as a result of adiabatic  expansion (compression). Dry adiabatic lapse rate
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This note was uploaded on 01/26/2012 for the course MET 1010 taught by Professor Matchev during the Spring '08 term at University of Florida.

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Chapter06a - Atmospheric Stability Mechanical Equilibrium...

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