Final answer:
Sublimation is the direct change from the solid state to the vapor state without going through the liquid state. An example is when solid iodine is warmed and it sublimes to form a purple vapor.
Step-by-step explanation:
Sublimation is the direct change from the solid state to the vapor state without going through the liquid state. It is the conversion of a solid to a gas. For example, when solid iodine is warmed, it sublimes and forms a purple vapor. The reverse process, where a gas directly becomes a solid, is called deposition. An example of deposition is the formation of frost.