Which phenomenon(s) is/are involved when a perfume sprayed at one end of a room can be smelled at another end of a room?

Which phenomenon(s) is/are involved when a perfume sprayed at one end

1.	Which phenomenon(s) is/are involved when a perfume sprayed at one end of a room can be smelled at another end of a room?
Answer» Which phenomenon(s) is/are involved when a perfume sprayed at one end of a room can be smelled at another end of a room?