Question

Which process do naphthalene balls undergo when left open?

Answer 1

when left open naphthalene balls undergo sublimation which is a process in which some substances change directly from solid form to gas without passing through the liquid form

Answer 2

Sublimation is that process which is responsible for change of state of Naphtaline ball from solid to vapour, when left open.

It can also be defined as the process by which a slow changes directly to its vapour state without having passing through its liquid state ,and the vapour changes directly back into soils in its original form.