Scuba Diving International (SDI) Computer Nitrox Practice Exam

Why is EAN32 considered a good choice for Nitrox diving?

1. It is only effective at shallow depths

2. It can be used to depths beyond sport diving limits

3. It is safe to use down to 40m/132 ft

4. It causes less nitrogen absorption

The correct answer is: It is safe to use down to 40m/132 ft

EAN32, or Enriched Air Nitrox with 32% oxygen, is regarded as a favorable choice for Nitrox diving primarily due to its oxygen content and the associated benefits of reduced nitrogen absorption. The correct answer highlights that EAN32 is indeed safe for use to a depth of 40 meters (132 feet). At this depth, divers are still within the recreational diving limits while benefiting from a lower nitrogen partial pressure compared to air. This reduced nitrogen exposure helps mitigate the risk of nitrogen narcosis and decompression sickness, allowing for longer dive times and improved safety on no-decompression dives. Diving at this depth while using EAN32 also means that divers can experience the effects of nitrogen more gradually, as the nitrogen loading during the dive is less than that of air, resulting in a reduced need for safety stops on ascent. The advantages of utilizing this mixture make it a highly suitable option for recreational divers looking to extend their bottom time without exceeding safe depth limits.