What type of breathing gas is nitrox classified as?

Nitrox is classified as a mid-range breathing gas due to its oxygen content, which typically varies from 21% to 40% oxygen, with most recreational nitrox mixes being around 32% or 36% oxygen. This places it between air, which is about 21% oxygen, and pure oxygen, which is 100% oxygen. The "mid-range" classification reflects its use in diving, as it allows divers to extend their bottom times and reduce nitrogen absorption compared to regular air without needing to use high levels of oxygen that could result in toxicity at deeper depths.

Understanding this categorization is essential for divers, as it influences dive planning, maximum operating depths, and safety protocols. Being aware of the characteristics of mid-range gases helps divers make informed decisions about their gas mixes and the risks associated with higher oxygen levels during different phases of their dives.