🌫️ Mountain Fog: Condensed Water, Droplet Size, Extinction and Visibility (2D)

Side view of a mountain summit in fog. Cool moist air past its dew point condenses liquid water; the droplets scatter light and a Koschmieder law turns that into how far you can see. Set the air temperature, humidity, cooling, droplet number and size spread, and watch posts at fixed distances fade into the fog, with the dew point, liquid water content, droplet radius, extinction and visibility. The vapour pressure law, the size distribution moments, a full Mie series and the Koschmieder threshold are checked numerically, with four in-page numerical checks.