In a mixture of gases the molecules of each gas collide with the walls of the container and exert a pressure. We call the pressure of a gas in a mixture of gases its partial pressure. The sum of all ...

A PaO2 test measures partial pressure of oxygen, or PaO2—the oxygen pressure in arterial blood. The PaO2 reflects how well oxygen is able to move from the lungs to the blood. It is often altered ...