why is the sublimation a physical change

Dear student,

Physical changes represent a change in the appearance of a substance, but not a change in its chemical formula. Chemical changes result in a new substance forming. Sublimation is a physical change. When a substance sublimes, it changes from a solid to a gas without going through the liquid phase. This does not result in a chemical change, though. An example of a common substance that goes through sublimation is dry ice. Dry ice is carbon dioxide in the solid phase. Dry ice sublimes at -109.3° F. This temperature is so low that it can cause frostbite if not handled with special insulating gloves.

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