The process by which a solid changes directly into a gas without first becoming a liquid is called

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1. 01

   Sublimation is the direct solid-to-gas change, skipping the liquid state entirely.

2. 02

   Camphor, naphthalene and dry ice all sublime, which is why they shrink away without leaving a puddle.

3. 03

   Evaporation is liquid to gas, condensation is gas to liquid, and fusion is the melting of a solid into a liquid.