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Firn

Firn er en kornete ismasse (tetthet: 450-830 kg/m3) bestående av krystaller med størrelse opp til 12 mm. Det er en overgangsfase mellom snø og isbre-is.

Den er typiske dannet ved gjentagende frysing og opptining av snøflak, spesielt på den øvre delen av en isbreer hvor snø ennå ikke er komprimert til is. Hastigheten på å konvertere snø til is is avhenger av blant annet mengden snøfall, temperaturvekslinger og mengde smeltevann.

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