Which phase change is known as sublimation?

• A. Liquid to gas
• B. Gas to solid
• C. Solid to liquid
• D. Solid to gas

Answer: (D)

Verified step by step guidance

1. Understand that phase changes describe the transition of a substance from one state of matter to another: solid, liquid, or gas.
2. Recall the common phase changes: melting (solid to liquid), freezing (liquid to solid), vaporization or evaporation (liquid to gas), condensation (gas to liquid), deposition (gas to solid), and sublimation (solid to gas).
3. Identify that sublimation specifically refers to the direct transition from the solid phase to the gas phase without passing through the liquid phase.
4. Compare the given options to the definitions of phase changes: 'Liquid to gas' is vaporization, 'Gas to solid' is deposition, 'Solid to liquid' is melting, and 'Solid to gas' is sublimation.
5. Conclude that the phase change known as sublimation is the transition from solid directly to gas.