Question

Water vapor turning directly to frost (gas to solid) is an example of __________.

Answer 1

This would be an example of deposition (Phase transition). 

Answer 2

Hey!

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The process by which solid directly turns to gas without going through the intermediate state- Liquid , this process is called as Sublimation.

Water vapor turning directly to frost (gas to solid) is an example of DE-SUBLIMATION.

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Hope it helps...!!!