What is the name of the process by which a solid changes directly into a gas?

Sublimation is the name of the process in which a solid changes directly into a gas without passing through the liquid state. This phenomenon occurs under certain conditions of temperature and pressure and is most commonly observed with substances like dry ice (solid carbon dioxide) and iodine. During sublimation, the molecules in the solid gain enough energy to break free from the solid structure and disperse as gas, showcasing the transition through only solid and gas phases. This process is utilized in various applications, including freeze-drying, where water is removed from a solid state directly into vapor, preserving the structure and nutrients of food.