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It won’t float away if you freeze it first, of course it will sublimate away but not all at once.
Edit: Melts, doesn’t sublimate, still won’t melt all at once though.
At atmospheric pressure it wouldn’t sublimate. It would just melt, then boil.
Good point, though it still won’t melt all at once though it takes time to melt and boil (not much time but still takes time).
