A gaseous substance turns directly into a solid. Which term describes this change?

• A. Evaporation
• B. Deposition
• C. Sublimation
• D. Condensation

Answer: (B)

Verified step by step guidance

1. Identify the phase change described: the substance changes directly from a gas to a solid without passing through the liquid phase.
2. Recall the definitions of phase changes: Evaporation is liquid to gas, Condensation is gas to liquid, Sublimation is solid to gas, and Deposition is gas to solid.
3. Match the described change (gas to solid) with the correct term, which is Deposition.
4. Understand that Deposition is the reverse process of Sublimation, where a gas turns directly into a solid.
5. Conclude that the term describing the change from gas directly to solid is Deposition.