Which term describes the change of state from solid to gas?

Which term describes the change of state from solid to gas?

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

Answer: (A)

Sublimation is the change from a solid directly into a gas without passing through a liquid phase. This happens when a solid gains enough energy that its particles break free into the vapor state, often under conditions of elevated temperature and/or low pressure. A classic example is dry ice turning into carbon dioxide gas at room temperature. This differs from melting (solid to liquid) and freezing (liquid to solid), and it’s the opposite of deposition (gas to solid). In practice, sublimation means you can have a solid releasing vapor even without melting first.

Sublimation is the change from a solid directly into a gas without passing through a liquid phase. This happens when a solid gains enough energy that its particles break free into the vapor state, often under conditions of elevated temperature and/or low pressure. A classic example is dry ice turning into carbon dioxide gas at room temperature. This differs from melting (solid to liquid) and freezing (liquid to solid), and it’s the opposite of deposition (gas to solid). In practice, sublimation means you can have a solid releasing vapor even without melting first.