Physics 1028 Study Guide - Final Guide: Hot Air Balloon, Operating Temperature, Molar Mass
Document Summary
First we consider the diver at a depth of 7. 0 m below the water surface without the snorkel tube. The external pressure on the diver"s body is given by pascal"s law. We assume a fresh water lake with water density = Note that we did not identify a value for the air pressure patm in this equation. While diving to this depth, the diver"s body adjusts to the pressure p in this equation by being slightly compressed until the internal pressure is in equilibrium with the external water pressure. This includes an increase in the gas pressure in the lungs and an increase in the blood pressure. That leads to a pressure difference between the inside of the lungs and the water outside the diver"s chest of: This difference corresponds roughly to 70% of atmospheric pressure, which is sufficient to collapse the lungs and force the still pressurized blood into the lungs.
