Precipitation I RECAP Moisture in the air (different types of humidity). Condensation and evaporation in the air (dew point). Stability of the atmosphere: determines the type of clouds
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in order to become raindrops!
(in equilibrium), hence:
Falling object Mass Area Terminal velocity
Skydiver 75 kg 0.7 m2 60 m/s 134 mi/hr
Baseball (3.66 cm) 145 gm 42 cm2 33 m/s 74 mi/hr
Golf ball (2 cm) 46 gm 14 cm2 32 m/s 72 mi/hr
Hail stone (0.5 cm radius) .48 gm .79 cm2 14 m/s 31 mi/hr
Raindrop (0.2 cm radius) .034 gm .13 cm2 9 m/s 20 mi/hr
m – mass, g – gravity acceleration, C-shape coefficient of proportionality, r-air density, A - area of the cross section of the body, v- velocity
Skip the sections “Cloud seeding and precipitation” and “Precipitation in clouds”