How can a cold solid turn into a gas? Skipping the liquid part?
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Liquids need a certain temperature and pressure range to exist. A good example is carbon dioxide (dry ice, when it’s solid), which needs more than five times atmospheric pressure to be a liquid at any temperature. Therefore, if the temperature is high enough, its phase will change from solid to vapor (or vice versa). Sublimation can also happen during solid-vapor equilibrium.
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