Equivalent narcotic depth
Equivalent Narcotic Depth (END) is a concept used in technical diving to assess the narcotic effect of breathing gases used in deep diving. The END is the depth in sea water at which a particular nitrogen-oxygen mixture would have the same narcotic effect as the actual gas mixture at the actual depth.
Concept[edit | edit source]
The concept of Equivalent Narcotic Depth is based on the observation that the narcotic effect of a gas is proportional to its partial pressure. This is known as the Dalton's Law of Partial Pressures. Therefore, the narcotic effect of a gas mixture at a given depth can be compared to the narcotic effect of a nitrogen-oxygen mixture at a different depth.
Calculation[edit | edit source]
The Equivalent Narcotic Depth is calculated by dividing the partial pressure of nitrogen in the breathing gas by the fraction of nitrogen in air (0.79), and then subtracting 1 to convert from absolute to gauge pressure. The result is then multiplied by 10 to convert from atmospheres to meters of sea water.
Applications[edit | edit source]
The Equivalent Narcotic Depth is used in the planning of technical dives to determine the appropriate breathing gas for a given depth. It is also used in the analysis of diving accidents to determine the likely level of narcosis at the time of the accident.
See also[edit | edit source]
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