EES 108 Class 09

EES 108 Class 09 - Moisture&Humidity EES108...

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EES 108 Thursday September 23 2010
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Sizes of particles
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Effect of curvature Raindrop Cloud droplet Very small droplets (<0.1 μm) will  evaporate to  nothing unless  RH > 110% (supersaturation)
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Inside Clouds Droplets: § Terminal velocity Bigger drops fall faster § Time to evaporate Bigger drops last longer § Maximum fall distance Speed × Time Bigger drops fall  much farther Cloud droplets: § 10–50 µm § Maximum fall distance  much less than LCL height Rain drops: § 1–4 mm § 100 times larger radius =  1 million times more water § Maximum fall distance > LCL height
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Solution Adding impurities to water reduces saturation  vapor pressure Adding impurities reduces supersaturation  necessary for consensation Consensation nuclei
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EES 108 Class 09 - Moisture&Humidity EES108...

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