The Pleural Cavity is a very important cavity in the body, simply because it consists of how a person breathes. It includes an intrapulmonary pressure, atmospheric pressure and airflow within the lungs. “Intrapulmonary pressure is the pressure within the lungs, atmospheric pressure is the pressure used in all directions at any given point by the weight of the atmosphere and air flow is simply the motion of air. Intrapulmonary pressure and atmospheric pressure are usually measured in units of millimeters of mercury. “Inspiration is the act of drawing air into the lungs and expiration is the exhalation of breath (Biology-Online Dictionary, 2005).” “Boyle’s Law is an ideal gas law where a constant temperature, the volume of an ideal gas is inversely
