The process of converting solid into vapor without passing through the liquid phase is called sublimation. This process occurs when solid substances gain sufficient energy to transition directly into vapor form, bypassing the liquid state entirely. Sublimation is commonly observed with substances like dry ice (solid carbon dioxide) and iodine. This phenomenon is utilized in various applications, including freeze-drying food and in certain industrial processes. Sublimation requires specific temperature and pressure conditions to occur, highlighting the unique physical properties of materials under different states.