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GEOG 2110L
David Stanley

ADIABATIC PROCESSES ** warm air is less dense(lighter) and thus rises * as air rises in the atmosphere, it expands * a parcel (or 'bubble') of air comes under less & less pressure as it rises & thus expands * as a gas (air) expands, the molecular action (kinetic energy) decreases thus the T° decreases ** cold air is more dense (heavier) and thus sinks * as air sinks in the atmosphere, it compresses * a parcel of air comes under more & more pressure as it sinks & thus is compressed * as a gas (air) compresses, the molecular action (kinetic energy) increases thus the T° increases SO, Expanding air = T° decrease Compressing air = T° increase ** BUT, the T° changes WITHOUT heat being added or subtracted. *** this is Adiabatic Temperature Change: changing the T° of the air without adding or subtracting heat Simply the result of compressing the sir or allowing it to expand. RESULT: ** Rising air in the atmosphere expands & cools. ** Sinking air in the atmosphere is compressed & warms. *** Rate of Adiabatic Change: * varies with humidity condition of air: Dry (unsaturated) air vs. Wet (saturated) air Dry Adiabatic Rate: (DAR or DALR) When air is unsaturated,
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