ADIABATIC PROCESSES - Fig. 7.17 pg. 191 d4e *** Rate of...

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ADIABATIC PROCESSES * warm air is less dense(lighter) and thus rises * as air rises, it expands ; as a gas (air) expands , the molecular action decreases thus the T° decreases * cold air is more dense (heavier) and thus sinks * as air sinks, it compresses ; as a gas (air) compresses , the molecular action increases thus the T° increases SO, Expanding air = T° decrease ** The T° changes WITHOUT heat being added or subtracted. *** this is Adiabatic Temperature Change : Changing the temperature of the air without adding or subtracting heat. The result of compressing air or allowing it to expand RESULT: Rising air in the atmosphere expands and cools Sinking air in the atmosphere is compressed and warms
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Unformatted text preview: Fig. 7.17 pg. 191 d4e *** Rate of Adiabatic Change : * varies with condition of air: dry vs. Wet 1) Dry Adiabatic Rate: (DAR or DALR) When air is unsaturated , air T > dew point T or RH < 100% * constant rate of 1 deg cel./100 m or 10degC/1000m * rising air = cools at 1C/100 m; sinking air = warms at 1C/100 m 2) Saturated Adiabatic Rate: (SAR or SALR) When the air is saturated , air T = d.p. T or RH = 100% variable rate: .5 deg-.9deg C/100m or 5deg-9deg/1000m condensation releases latent heat thus slowing that rate of cooling(or warming) ** condensation level: height at which condensation occurs; where cloud formation begins(usually seen as the bottom of a cloud mass) RH = 100%; air T = d.p. T...
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This note was uploaded on 04/14/2008 for the course GEOG 1111 taught by Professor Hopkins during the Spring '08 term at University of Georgia Athens.

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