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EAN
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Enriched Air Nitrox. A N2/O2 (nitrogen/oxygen) breathing gas containing more oxygen (typically 32 or 36 percent) and less nitrogen than plain air. Used by recreational divers to increase either bottom time or safety margin by decreasing the amount of nitrogen absorbed. Requires predive testing of gas mixture and adherence to strict depth restrictions.
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Ebb Current
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A movement of tidal current away from shore or down a tidal stream; tide that is flowing out or causing a lower water level.
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Eddy
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A circular movement of water, in a comparatively limited area, formed on the side of a main current; may be created at a point where the mainstream passes a projection or meets an opposite current.
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Equalization
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The act of forcing air into an open space to offset increasing water pressure.
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Eustachian tube
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A short tube connecting the back of the nose to the middle ear. If clogged, by mucus, equalization is next to impossible.
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Exposure protection
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Garment worn to prevent decreases in core body temperature and abrasions. Protection can range from thin body suits to heavy dry suits.
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