What does PPO2 stand for in the context of Nitrox diving?

PPO2 stands for Partial Pressure of Oxygen, which is a critical concept in Nitrox diving. It refers to the pressure exerted by oxygen in a mixture, particularly when breathing gas is under pressure, such as underwater. Understanding PPO2 is essential for divers as it helps determine the risk of oxygen toxicity, which can occur at higher pressures when a diver is exposed to elevated levels of oxygen. By managing the PPO2 within safe limits, divers can maximize the benefits of using Nitrox while minimizing potential hazards associated with high levels of oxygen, leading to safer diving practices. This knowledge is particularly relevant when planning dives, as divers must be aware of their depth and the percentage of oxygen in their breathing gas mixtures to avoid health risks.