Hoarfrost and Yukimarimo

Hoarfrost patterns are often described as being feathery, needle-like or spiny. But this morning in a double-glass window that is no longer perfectly sealed, there was hoarfrost with a fiddle-head pattern. ( If we have to insist on comparing one aspect of nature to another!) Here's what I saw in a time span of about... Continue Reading →

At the Mercy of Diffusion

Both the mechanism and appearance of hoarfrost are sublime. Hoarfrost results when water vapor encounters a very cold surface and undergoes reverse sublimation. Such ice crystals normally grow on the ground, but it can also form on twigs or on a poorly insulated pane of glass.The latter is usually called  "window frost" because of its flatter appearance. But it's no... Continue Reading →


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