Which process is the change from a gas to a solid?

Which process is the change from a gas to a solid?

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

Answer: (B)

Gas to solid is a direct phase change called deposition. It happens when energy is removed from gas molecules enough that they arrange directly into a solid lattice, bypassing the liquid phase. A familiar example is frost forming on a cold surface from water vapor. This contrasts with condensation (gas to liquid) and freezing (liquid to solid), while sublimation is the opposite direction (solid to gas). So the process described is deposition.

Gas to solid is a direct phase change called deposition. It happens when energy is removed from gas molecules enough that they arrange directly into a solid lattice, bypassing the liquid phase. A familiar example is frost forming on a cold surface from water vapor. This contrasts with condensation (gas to liquid) and freezing (liquid to solid), while sublimation is the opposite direction (solid to gas). So the process described is deposition.