File:Compendium of meteorology (1951) (20483706898).jpg

Title: Compendium of meteorology
Identifier: compendiumofmete00amer (find matches)
Year: 1951 (1950s)
Authors: American Meteorological Society. Committee on the Compendium of Meteorology; Malone, Thomas F
Subjects: Meteorology
Publisher: Boston : American Meteorological Society
Contributing Library: MBLWHOI Library
Digitizing Sponsor: Boston Library Consortium Member Libraries

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208 CLOUD PHYSICS window panes of houses. These ice flowers are of two kinds: window frost and window ice. The former is a product of the sublimation or freezing of minute super- cooled droplets; the latter results from the freezing of a water film. Window ice is likely to be formed in a kitchen or bathroom, where the moisture is abundant and the indoor temperature is just below freezing. The excessive water vapor condenses on the pane as a thin water film, and the mosaic of ice crystals obtained by the freezing of this thin film gives window ice. Window frost is quite different from window ice in niunerous infinitesimal droplets condense on the surface, and the glass plate takes on a blurred appearance. After a little while, many germs' of hoar crystals appear at diverse points and begin to grow. As soon as growth starts, the blurred surface around the crystal begins to clear, that is,, the minute droplets in that region evaporate. The vapor pressure of supercooled water is higher than that of ice at the same temperature, so the water is evaporated from the droplets and con- denses on the hoar crystal, resulting in the growth of the latter at the expense of the former. The process is
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