What is the process of gas directly changing into a solid called?

The process in which a solid is directly changes to gas phase without converting solid into liquid is called sublimation. The temperature required to change solid into gas is kept below the melting temperature otherwise we would get liquid stage. 

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Sublimation

(remember? we studied in 8th)

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It is called sublimation.

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the process is called sublimation. eg. camphor

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that process is known as sublimation

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