When a solid substance disappears completely as a gas on heating, the substance is said to have undergone?

When a solid substance disappears completely as a gas on heating, the substance is said to have undergone sublimation. Sublimation is a process where a solid substance turns into a gas without first becoming a liquid. This occurs when the energy applied to the solid is enough to overcome the forces holding its particles together, causing it to transition directly into a gaseous state. Crystallization is the process by which a liquid solidifies into a crystalline solid, while distillation is a process used to separate mixtures of liquids based on their boiling points. Evaporation is the process by which a liquid turns into a gas at the surface of the liquid. These processes are different from sublimation and do not involve the solid disappearing completely as a gas upon heating.