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This process is called sublimation. The opposite (deposition) is where a gas turns directly into a solid. Sublimation occurs if the pressure and temperature are right for the specific substance, so that the solid phase in a phase diagram borders the gas phase.

Examples are: Carbon Dioxide cannot exist as a liquid state at 1 atmosphere pressure, so dry ice (frozen carbon dioxide) turns directly to a gas. In your freezer, ice cubes can sublime away directly into water vapor while in the freezer.

An example of deposition is: Formation of frost and snowflakes directly from water vapor occur at the proper temperature and air pressure.

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14y ago

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