And as they begin to relax, we're essentially moving in the opposite direction along the following curve. So the diaphragm begins to recreate the following dome shape and that pushes on our cavity and it pushes on the space inside. And the Rift cage, as it basically decreases in size, it also forces our volume inside the intraplural space to decrease. And by Boils law, when we decrease our volume, we increase our pressure as long as the temperature is allowed to be constant. And so what happens is, because the pressure inside our intraplural space drops, eventually the pressure inside the intraplural space at the end of that relaxation where when we're at this point, the pressure inside the intraplural space will be greater than the pressure outside of our environment so outside of the body and inside the lung. And in that case, that pressure gradient will force the air to move from the lungs to the outside.