What does the acronym “EAD” stand for in Nitrox diving?

The term "EAD" stands for Equivalent Air Depth, which is a crucial concept in Nitrox diving. EAD is used to determine the depth at which a mixed gas dive would have the same partial pressure of the inert gases (like nitrogen) as a dive using air at a specific depth. This calculation helps divers understand the effects of deeper depths when breathing a gas mixture with elevated oxygen levels, such as Nitrox.

When diving with Nitrox, the use of EAD aids in planning dives and managing no-decompression limits because it allows divers to compare their Nitrox exposure to traditional air dives. By converting the dive to its equivalent air depth, divers can use air tables to estimate nitrogen loading and make better-informed decisions regarding dive plans, including ascent rates and safety stops.

Understanding EAD is important for preventing excessive nitrogen absorption, which can lead to decompression sickness. This concept underlines the importance of using the correct gas mixtures for the depth you're diving, ensuring a safer dive experience.