INTRAPULMONARY PRESSURE CHANGES Intrapulmonary (intra-alveolar) pressure is the pressure within the alveoli. Between breaths, it equals atmospheric pressure(760 mm Hg INTRAPULMONARY PRESSURE 0 9760 rrmm. nlG INTRAPULMONARY PRESSURE (m Hg) 761 0AEE4760 759 INSPIRATION EXPIRATION