The solid-vapour equilibrium can be represented as

The solid-vapour equilibrium can be represented as

${\mathrm{I}}_2\text{ (solid) }\rightleftharpoons {\mathrm{I}}_2\text{ (vapour) }$

$\text{ Camphor (solid) }\rightleftharpoons \text{ Camphor (vapour) }$

${\mathrm{NH}}_4\mathrm{Cl}\left(\mathrm{solid}\right)\rightleftharpoons {\mathrm{NH}}_4\mathrm{Cl}\left(\text{ vapour }\right)$ ,all the three can undergo sublimation