Enriched Air Nitrox Level 2 Practice Test 2025 – Complete Exam Prep

The relationship between a diver's depth and allowable exposure time to Enriched Air Nitrox (EANx) is primarily driven by the principles of nitrogen absorption and partial pressures at greater depths. As a diver descends, the ambient pressure increases, which in turn increases the partial pressure of the gases present in the breathing mix, including nitrogen.

When using EANx, the aim is to limit the amount of nitrogen a diver takes in to reduce the risk of decompression sickness. As depth increases, the rate at which nitrogen is absorbed by the body also increases due to the higher partial pressure. Consequently, the allowable exposure time at deeper depths becomes shorter to minimize the risk of nitrogen narcosis and decompression sickness when ascending.

Understanding this concept is crucial for divers utilizing EANx, as it directly influences planning and safety practices. The need to monitor depth and adjust dive durations accordingly is essential to ensure safe diving operations and effective use of enriched air.