Change of State in Matter Using the Kinetic Theory: Sublimation

Why does the size of naphthalene balls decrease when left open ?

 Fill in the blank

.............. is a process that involves direct conversion of a solid into its vapour on heating.

Describe the process of  sublimation with examples.

Describe an experiment to demonstrate the process of sublimation.

What do you mean by sublimation ? Explain with an example.