Is

Is er frosset vann H2O. Is er altså H2O i fast from, mens vann er H2O i flytende form. Under normale forhold på jordoverflaten blir faktisk is (men ikke vann) betraktet som et mineral. Vannets fryse- og smeltepunkt avhenger noe av lufttrykk i de lokale omgivelsene og er cirka 0°C. Variasjonen er derimot for nesten ubetydelig å regne i forhold til forskjellene som oppstår i vannets kokepunkt pga. trykkforskjeller.

Det finnes mange typer is, f.eks. snø, snøfnug, hagl, firn, isbre, og sjøis.

Fasediagram for vann (kilde: Garrison 1991)

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