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Sublimation is the process of conversion of a solid directly to a gaseous state.
this method can be use to separate a volatile substance from a mixture.
for example lets take a mixture of iron fillings and iodine(iodine is a volatile material).in a china dish.place a funnel upside down on it .Close the funnel with a cotton ball. now heat the dish. Iodine sublimates  and settle on the walls of the funnel.hence the mixture is separated.
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Sublimation is process in which solid is direct convert to vapour. Simple example of sublimation is dry ice, naphthalene balls, camphor, iodine crystals etc.
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