The term for the change of a substance from solid to gas without passing through the liquid phase is called sublimation. This process occurs under specific conditions, typically when a solid's vapor pressure exceeds atmospheric pressure, allowing the molecules to escape directly into the gas phase. Common examples include dry ice (solid carbon dioxide) transitioning into carbon dioxide gas, and ice turning into vapor in low-temperature environments. Sublimation is an important phenomenon in various scientific fields and is used in applications like freeze-drying.