NAUI Nitrox Diver Practice Exam

The primary use of a Nitrox gas mixture is to reduce nitrogen absorption during dives. Nitrox, a blend of nitrogen and oxygen with a higher proportion of oxygen than that found in regular air, allows divers to take in less nitrogen while breathing. This decreased nitrogen uptake lowers the risk of nitrogen narcosis and decompression sickness, often referred to as "the bends."

By using Nitrox, divers can safely extend their bottom time at certain depths without the same level of nitrogen exposure associated with standard air. This is particularly beneficial for repetitive dives or when engaging in deep diving activities.

The other options do not accurately reflect the primary purpose of using Nitrox. For instance, while some divers may perceive enhanced colors underwater due to improved visibility or environmental conditions, this is not a fundamental attribute of Nitrox itself. Similarly, Nitrox is not designed to increase dive depth or improve buoyancy; those elements are managed through dive planning, gear, and personal buoyancy control techniques.