# When dry ice is exposed to the air it changes to a vapor. What is an example of?

$\text{Sublimation........}$
Sublimation describes the phase transition, $\text{solid "rarr" gas}$. The reverse phase transition is $\text{deposition}$.
Here, $C {O}_{2} \left(s\right) \rightarrow C {O}_{2} \left(g\right) \uparrow$