Answer:
Diffusion takes place when the lid of a perfume bottle is opened.
Explanation:
When the lid of the bottle is opened then high pressurized liquid comes from the nozzle of the bottle in the gaseous form.As we know that the force of attraction between the gaseous molecules is least so, they start moving in all direction and spread in the wide area.This process is known as diffusion.Due to which we get the fragrance of perfume.
there are many a scents which doesnt come with a cap anyways...so i guess it should be fine...but then..who knows...
i would still like to believe that, if a scent with out cap is left for too long without use...the nozzle could get a lil dirty and clog in time....just a thought...