Sublimate
The word is sublimate, a transition from a solid directly to gas. Snow and ice can do this, at times, when the temperature is below freezing.
Two well-known substances that sublime fairly easily are dry ice and the chemical Naphthalene, used in moth balls.
Since we're talking about snow and ice and such, it's interesting to note that the opposite of sublimation is deposition. The formation of frost is an example of meteorological deposition. I'm sure our weather experts here on the Forum can provide a lot more interesting explanations.
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