Chapter07a - Precipitation I where it expands...

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Precipitation I
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RECAP Moisture in the air (different types of hum idity). Condensation and evaporation in the air (dew point). Stability of the atmosphere: determ ines the type of clouds Cloud formation: moist air rises up in the atmosphere where it expands adiabatically, cools down, saturates and forms clouds. Chapter 7: precipitation. Any form of water (liquid or solid) that falls from a cloud and reaches the ground.
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From droplets to raindrops Typical sizes (diameter) Condensation nuclei: 0.2 μ m Cloud droplet: 20 μ m Raindrop: 2000 μ m The cloud droplets need to grow in order to become raindrops! Growth is determined by the balance of condensation (C) and evaporation (E) C>E the droplet grows C<E the droplet gets smaller C=E the droplet stays the same (in equilibrium), hence: Saturation (equilibrium) vapor pressure
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The growth of cloud droplets Curvature effect: The saturation water vapor pressure depends on the curvature of the water surface. The larger the curvature the easier it is for the water molecules to leave the surface of the liquid water. The
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Chapter07a - Precipitation I where it expands...

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