Question

why in the bottle perfume is in the liquid foam​

Answer 1

Foam or lather is created when foaming agents in soaps, detergents and shampoos mix with air and water. The most common foaming agents used in personal care are chemicals sodium laureth sulfate (SLES), sodium lauryl sulfate (sometimes referred to as sodium dodecyl sulfate or SLS) and coco-glucoside

Answer 2

Explanation:

Actually inside the perfume bottle thescent is stored in high pressure conditions and hence inside the bottle it is liquid but when you open it,it changes to vapour form and gradually into gas.