What is the Normal Intrapulmonary Pressures?

Intrapulmonary presssures (the pressure within the lung) changes during the inspiratory and expiratory phase of respiration.

During inspiratation, the intrapulmonary pressure is usually 759 mmHg or lower, which causes the outside atmospheric pressure (which is 760 mmHg) to be sucked into the lungs to create an equilibrium (balance).

During expiration, the intrapulmonary pressure is usually 761 mmHg or higher, which causes the air from within the lungs to be forced out into the lower pressure of the atmosphere.