How to Calculate Partial Pressure of Oxygen
When divers go through Nitrox classes, one of the things they should learn is that the human body doesn’t respond to the percentage of oxygen in the gas mixture, but rather our bodies are affected by the pressure of oxygen. For example, if we travel from sea level to an elevation of 14,000 feet, we will start to breath harder and feel like we aren’t getting enough air. The percentage of oxygen at sea level is 21% and the percentage of oxygen at 14,000 feet is also 21%. So the difference is that there is less pressure at a higher elevation. This is what our bodies are responding to. Our bodies have evolved to breath oxygen at sea level. (more…)



