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Matter in Our Surroundings — Science STD 9 — Question

Gujarat BoardEnglish MediumSTD 9ScienceMatter in Our Surroundings1 Mark
Question
Name the term used for:
  1. Solid directly formed from the gas.
  2. Gas directly formed from the solid.
✓

Answer

  1. When a solid substance converts directly into gas without going through the liquid phase it is called Sublimation.
  2. On the contrary when gas directly forms into solid omitting the intermediate stage of liquefying it is called deposition or desublimation.
Sublimation is an endothermic process, where as Desublimation is a thermodynamic process.

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