Sublimation is a ________ process.

Sublimation is a ________ process.

• A. Heating
• B. Cooling
• C. Mixing
• D. Filtering

Answer: (A)

Sublimation is a phase change in which a solid becomes a gas without passing through a liquid. This happens when heat is added to the solid, giving its particles enough energy to overcome intermolecular forces and escape into the air as a gas. The surrounding pressure also matters, but the key idea is that energy input drives the solid directly into the gaseous state. It’s not a cooling, mixing, or filtering process—the other options describe different actions or changes that don’t involve turning a solid into a gas via heat. A common example is dry ice subliming at room temperature.

Sublimation is a phase change in which a solid becomes a gas without passing through a liquid. This happens when heat is added to the solid, giving its particles enough energy to overcome intermolecular forces and escape into the air as a gas. The surrounding pressure also matters, but the key idea is that energy input drives the solid directly into the gaseous state. It’s not a cooling, mixing, or filtering process—the other options describe different actions or changes that don’t involve turning a solid into a gas via heat. A common example is dry ice subliming at room temperature.