Now let's begin with the outer ear. The outer ear basically contains a section known as the pinna, or the oracle. So this entire section, including our ear lobe, is known as arabina. Now, the pinna, what it basically does is it captures all the energy that is carried by our mechanical wave and it directs that mechanical wave into the ear canal. And because the pinna has such a large surface area, it basically acts to amplify the force that our pressure wave actually creates. So the human ear can detect variations in air pressure known as mechanical waves.