Question

Define sublimation.

Answer 1

1. Definition: The process of conversion of a solid substance directly into its vapours on heating and vapour into solid on cooling is called sublimation.
2. This method of separation is possible only when one of the constituents sublimes on heating and the other substance is left behind as the non-sublimable substance.
3. The solid substance obtained by cooling the vapours is known as sublimate and the vapours are called sublime.
4. For example, a mixture of non-sublimable salts like sodium chloride$\left(\mathrm{NaCl}\right)$ and sublimable ammonium chloride$\left({\mathrm{NH}}_4\mathrm{Cl}\right)$.