What do the terms EANx and Nitrox represent in diving?

The terms EANx and Nitrox refer to different names for the same gas mixture of nitrogen and oxygen used in diving. EANx stands for Enriched Air Nitrox, where "EAN" signifies that the air is enriched with oxygen, and the "x" denotes the percentage of oxygen in the mixture compared to regular air, which contains approximately 21% oxygen and 79% nitrogen. Nitrox is commonly used to reduce the risk of nitrogen narcosis and increase bottom time during dives, especially in recreational diving.

This definition highlights not only the chemical composition but also emphasizes that both terms represent a specific type of breathing gas that divers can use, enhancing safety and dive performance. The correct choice underlines the dual nomenclature for the same concept within the context of diving practices.