False colour SEM of hoar frost

False colour SEM of hoar frost

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Credit: DR JEREMY BURGESS/SCIENCE PHOTO LIBRARY

Caption: False-colour scanning electron micrograph of crystals of hoar frost, which grow on surfaces during frosty nights of high humidity. The crystals have hexagonal symmetry, as do snowflakes, but instead of growing as a star (dendritic crystals) they grow as a six-sided tube (prismatic crystals). The change of form is due to the temperature during crystal grow; prismatic crystals like this only form at between -5 to -8 degrees Celsius. Magnification: x 15 at 6x4.5cm size.

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Keywords: climate, coloured, frost, hoar, hoar frost, meteorology, sem, weather

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