Equivalent air depth
Method of comparing decompression requirements for air and a given nitrox mix / From Wikipedia, the free encyclopedia
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This article is about calculating decompression using nitrox. For calculating narcotic effects using trimix, see Equivalent narcotic depth.
The equivalent air depth (EAD) is a way of approximating the decompression requirements of breathing gas mixtures that contain nitrogen and oxygen in different proportions to those in air, known as nitrox.[1][2][3]
The equivalent air depth, for a given nitrox mix and depth, is the depth of a dive when breathing air that would have the same partial pressure of nitrogen. So, for example, a gas mix containing 36% oxygen (EAN36) being used at 27 metres (89 ft) has an EAD of 20 metres (66 ft).