Chemistry

Question Analysis
This question assesses the knowledge of phase changes, specifically the process of sublimation.

Key Concept Explanation
Sublimation is the phase change where a solid transitions directly into a gas without becoming a liquid first. This process requires the absorption of heat.

Step-by-step Solution
1. Identify the phase change described in the question: solid to gas without passing through the liquid state.
2. Recall the definition of sublimation: the direct transition from solid to gas.