GLG 121 Lecture Notes - Lecture 7: Lake Hefner, Water Vapor, Evaporation
26 Oct 2016
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The highest energy droplets evaporate first and cooler ones are left behind. This is why you feel cold stepping out of a shower. At an increasing rate why fog disappears when it warms up. Evaporation and water quality: water quality has a small, but measurable effect on evaporation rates, a salt content of 1% will slow down evaporation by 1% Smaller lakes heat up and cool down fastest. Solar input reacts faster with smaller lakes. Measuring evaporation: how to measure (video, lake hefner experiment. The process by which water vapor becomes liquid water: 1. Water vapor must be cooled to a dew point. Dew point = the point at which condensation begins. As air rises, it cools, and loses ability to hold moisture: 2. Water vapor molecules require a nucleation site for condensation to occur. Condensation nuclei = tiny particles which provide surface water formation. Process of condensation: condensation should occur when local air mass reaches saturation.
