A bottle of perfume was opened in a room . The smell of its vapours spread in the entire room. Name the property of gases which responsible for this behaviour of perfume vapours.

When we open a bottle of perfume in a room, we can smell it even from considerable distance. This is because, when the perfume is opened, that gas of the perfume moves from its areas of high concentration to its areas of low concentration. This process is called diffusion. This is the scientific reason behind getting the smell of perfume from far away places.