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Snowflake
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This article is about snow. For other uses, see
Snowflake (disambiguation).
Snowflake viewed in an optical microscope
Snowflakes are conglomerations of frozen ice crystals which fall through the
Earth's atmosphere. They begin as
snow crystals which develop when microscopic
supercooled cloud droplets
freeze. Snowflakes come in a variety of sizes and shapes. Complex shapes emerge as the flake moves through differing temperature and humidity regimes. Individual snowflakes are nearly unique in structure. Types which fall in the form of a ball due to melting and refreezing, rather than a flake, are known as
graupel, with
ice pellets and snow grains as examples of graupel.
Contents
Formation
Sketch of snow crystal by
René Descartes
Snow crystals form when tiny
supercooled cloud droplets (about 10
?m in diameter)
freeze. These droplets are able to remain liquid at temperatures lower than ?18
°C (?0
°F), because to freeze, a few
molecules in the droplet need to get together by chance to form an arrangement similar to that in an ice lattice; then the droplet freezes around this "nucleus." ...
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