Answer with Explanation:
"Diffusion" could speed up the movement of perfume sprayed on one side of the room to the other side of the room.
Once a perfume is sprayed, it contains gas particles that readily takes up the space in the room. As you may have known, gas particles spontaneously travels from an area of high-concentration to an area of low-concentration. Thus, its very normal for the molecules to fill up the room's space because it has low concentration. Once this happens, the perfumed can be smelled on the other end (though it may take a little bit of time).
Getting to the other end of the room is possible because of "collision." The perfume's particles collide with other molecules in order to travel to the other end.