What is sublimation?

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RRB NTPC CBT 2 Level -6 Official paper (Held On: 9 May 2022 Shift 1)
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  1. direct change of a substance from a gas to a liquid state
  2. direct change of a substance from a gas to a solid state
  3. direct change of a substance from a liquid to a gas state
  4. direct change of a substance from a solid to a gas state

Answer (Detailed Solution Below)

Option 4 : direct change of a substance from a solid to a gas state
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Detailed Solution

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The correct answer is the direct change of a substance from a solid to a gas state.

Key Points

  • Sublimation is a process in which a solid transforms directly into vapours without changing into liquid.
  • This phenomenon can be seen in camphor or naphthalene balls.
  • In the process snow or ice transforms directly into water vapour without becoming water.

Additional Information 

  • DepositionIt is the process of conversion of a gas to a solid.
  • Evaporation - It is the process of conversion of a liquid into gas.
  • Fusion/Melting - It is the process of conversion of a solid into a liquid.
  • Condensation - It is the process of conversion of a gas into a liquid.
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