IANTD Enriched Air (Nitrox) Practice Test

The correct answer emphasizes that the partial pressure of nitrogen in a Nitrox mixture is lower compared to air, which is beneficial for divers. When using Nitrox—oxygen-rich gas with reduced nitrogen content—the overall percentage of nitrogen that divers absorb while submerged decreases. This reduction in nitrogen exposure directly correlates to a lower risk of nitrogen narcosis, a condition caused by elevated levels of nitrogen in the body at higher pressures.

In essence, by diving with Nitrox, divers experience less nitrogen in their system, which translates to reduced nitrogen absorption during their dives. This can lead to decreased incidences of decompression sickness and other nitrogen-related issues, enhancing the overall safety and comfort in diving environments. Understanding the role of partial pressure in this context is crucial for making informed decisions about dive planning and gas selection for safe diving practices.