Final answer:
Sublimation is the process of changing from a solid to a gas without going through the liquid phase.
Step-by-step explanation:
The process of changing from a solid to a gas is referred to as sublimation. Sublimation is the conversion of a solid (relatively high density) to a gas (much lesser density) without going through the liquid phase. An example of sublimation is when dry ice (solid CO₂) evaporates directly into a gas without melting into a liquid.