Meteorology for Air Pollution Control Engineers23

Meteorology for Air Pollution Control Engineers23 - would...

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1 n As a mass of air rises, the total pressure P decreases. n However, the vapor pressure of pure water, pwater, also  decreases because it depends only on the temperature,  which also decrease as the elevation increases. n The combined effect of these two opposing factors is  shown in Fig. 5.11 (next slide), which is based on the  “standard atmosphere”.
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3 n T , P , p  RH  with elevation (From  ↓ ↓↓ ↓↓↓ ↑↑↑↑ Fig. 5.11). n If the relative humidity at the surface were 50%, it 
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Unformatted text preview: would reach 100% (and moisture would just begin to condense if enough condensation nuclei were present) at 2,150 m. 4 n If the air is initially at 90% RH, it would only have to increase its RH by a factor of 1.11, corresponding to about 450 m, to condense. n Next slide (Fig. 5.12) An air mass flowing up over a mountain and down the other side....
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Meteorology for Air Pollution Control Engineers23 - would...

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