SDI Computer Nitrox Practice Exam

Using Nitrox can increase no-decompression limits compared to air because Nitrox has a higher percentage of oxygen and a lower percentage of nitrogen. When divers breathe a gas mix with a higher oxygen content, their nitrogen uptake is reduced. This is due to the fact that the presence of oxygen allows for a safer ascent to the surface, as it reduces the overall nitrogen load on the body. In practical terms, this means that divers using Nitrox can stay at a depth longer without having to perform mandatory decompression stops compared to if they were using regular air. Increased no-decompression limits can enhance safety during dives, allowing for longer dive times and a wider range of dive profiles. This is especially beneficial for deep dives where nitrogen narcosis and decompression sickness are greater concerns. Therefore, Nitrox provides a significant advantage in mitigating these risks and allows divers to extend their no-decompression limits effectively.