Meteorology for Air Pollution Control Engineers12

# Meteorology for Air Pollution Control Engineers12 - (5 n...

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1 n The balloon undergoes a reversible, adiabatic process. n If the air in the balloon were in the open but did not mix  significantly with its surrounding air, it would behave  the same way. n Thus, for any parcel of air, moving upward without  significant mixing with the air around it, reversible  adiabatic behavior would be observed.

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2 n From any thermodynamics book one finds that, for a perfect gas  undergoing a reversible, adiabatic process (also called an isentropic  process): (4) where Cp is the heat capacity of the gas at constant pressure. p C dP dT P R T =
3 n Eliminating dP/P from Eqs. (3) and (4) and rearranging, we find

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Unformatted text preview: (5) n For air at the gravity of the earth, ( 29 , dT adiabatic dz perfect gas p gM C = -( 29 2 2 3 9.81 / 29 / 3.5 8.314 / / 1000 0.00978 9.78 10 dT dz p o o gM m s g mol kg Pa m s C m Pa mol K g kg K C C m km km × = -= -× × × = -= -≈ -g g g 4 n This temperature gradient is called the adiabatic lapse rate, and is normally stated as a positive number. n If the numberical value of the lapse rate is greater than the adiabatic lapse rate, it is called a superadiabatic lapse rate. n If it is less than the adiabatic lapse rate, it is called a subadiabatic lapse rate....
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Meteorology for Air Pollution Control Engineers12 - (5 n...

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