# What is a change in phase from a solid directly to a gas?

$\text{Sublimation...............}$
Sublimation involves the transition $\text{solid}$ $\rightarrow$ $\text{gas}$ WITHOUT the intermediacy of the liquid phase. At normal (atmospheric) pressure, a few substances sublime, most notably dry ice, whose sublimation temperature is $- 78$ ""^@C.
The reverse of this transition is called $\text{deposition}$.