Abstract
A description is presented of the newly adaptedFindeisen low-pressure cloud chamber and of the first measurements made to determine the influence of temperature and expansion rate on the start and duration of fog. The relations obtained are explained by physical and chemical properties of condensation nuclei and of their surfaces. A deviation from the obtained dependence of the start of fog on air temperature, supersaturation and expansion rate is explained by means of the simplifiedFindeisen formula for computing maximal supersaturation in water clouds. An attempt is made to calculate the radii of droplets from coloured rings brought about by diffraction of light on fog droplets.
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