Chapter06a - Atmospheric Stability Mechanical Equilibrium G...

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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 05/29/2011 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 G...

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