Final answer:
Intrapulmonary pressure is measured in the volume of the alveoli in the lungs and it changes during breathing.
Step-by-step explanation:
Intrapulmonary pressure, also known as intra-alveolar pressure, is the pressure of the air within the alveoli of the lungs. It changes during the different phases of breathing. Because the alveoli are connected to the atmosphere, the intrapulmonary pressure always equalizes with the atmospheric pressure.