Why do you get the smell of perfume sitting several meters away?

Molecules in the air are bouncing around and moving very fast. When you speak, you are causing movements in the air particles. This means that particles in the air are moving close to the speed of sound. So when you smell perfume from several meters away, its because those organic molecules have traveled far enough to find your nose.

The process is called simple diffusion, and it is the movement of molecules from a high concentration to a low concentration, until equilibrium is reached. The can be through a medium of air or water.