What is the process called when gas transforms directly into a solid?

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

Answer: (B)

The process of gas transforming directly into a solid is known as deposition. In this process, molecules transition from a gaseous state to a solid state without passing through a liquid state. This phenomenon is commonly observed in certain atmospheric conditions, such as the formation of frost. During deposition, the gas particles lose energy and come together to form a solid structure, often observed in nature when water vapor in the air turns directly into ice crystals.

Sublimation, on the other hand, describes the process where a solid turns directly into a gas. Freezing refers to the transformation of a liquid into a solid, while condensation involves the transition of gas to liquid. Understanding these definitions clarifies how each process differs, and it's essential to connect each term correctly with the changes in the states of matter.