What is the term for when a solid transitions directly into a gas without becoming a liquid?

What is the term for when a solid transitions directly into a gas without becoming a liquid?

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

Answer: (D)

The term that describes the process in which a solid transitions directly into a gas without going through the liquid phase is sublimation. This phenomenon occurs under specific conditions, typically at low pressures or when the solid is heated, allowing the molecules to gain enough energy to break free from their structured arrangement and enter the gaseous state. Sublimation is observed in substances like dry ice (solid carbon dioxide), which sublimates at room temperature, and in the process of snow disappearing on cold, dry days. This contrasts with other processes such as melting, where a solid becomes a liquid, or evaporation, where a liquid becomes a gas. Condensation, on the other hand, is the reverse process of gas becoming a liquid. Understanding sublimation is important in various scientific applications, including freeze-drying and phase transitions in chemical systems.

The term that describes the process in which a solid transitions directly into a gas without going through the liquid phase is sublimation. This phenomenon occurs under specific conditions, typically at low pressures or when the solid is heated, allowing the molecules to gain enough energy to break free from their structured arrangement and enter the gaseous state.

Sublimation is observed in substances like dry ice (solid carbon dioxide), which sublimates at room temperature, and in the process of snow disappearing on cold, dry days. This contrasts with other processes such as melting, where a solid becomes a liquid, or evaporation, where a liquid becomes a gas. Condensation, on the other hand, is the reverse process of gas becoming a liquid. Understanding sublimation is important in various scientific applications, including freeze-drying and phase transitions in chemical systems.