What does ppO2 stand for?

ppO2 stands for Partial Pressure of Oxygen. In diving and other related fields, partial pressure refers to the pressure that an individual gas in a mixture would exert if it occupied the entire volume by itself at the same temperature. Understanding ppO2 is crucial for divers using Enriched Air Nitrox, as it directly relates to the oxygen content in the breathing gas mix and its implications for oxygen toxicity and safe diving practices.

When divers talk about ppO2, they are particularly concerned about managing the levels of oxygen they inhale during their dives. Elevated partial pressures of oxygen can lead to oxygen toxicity, affecting the nervous system and potentially causing serious health risks. Thus, monitoring ppO2 helps divers ensure they stay within safe limits while utilizing enriched air nitrox.

While nitrogen is a significant component of breathing gases, its partial pressure is not represented by the term ppO2, making that choice incorrect. Similarly, "Air" and "Nitrox" refer to gas mixtures rather than specific pressures acting on the gases within those mixtures, further clarifying why they are not the right terms associated with the abbreviation ppO2.