10 Terms
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Scuba diving
Underwater diving in which the diver uses scuba gears to breathe underwater.
Industry: Sports
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Scuba diving
Actual bottom time (ABT)
Sports; Scuba diving
Total elapsed time in minutes from leaving the surface until ascent is initiated.
Eddy
Sports; Scuba diving
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.
Water pressure
Sports; Scuba diving
Force per unit area exerted by the weight of water, each 33 feet of sea water exerts a pressure equivalent to one atmosphere, or 14. 7psa.
Halocline
Sports; Scuba diving
A Halocline is a change in the salt content of the water, but is not often apparent to divers unless severe enough to cause buoyancy changes.
Sinuses
Sports; Scuba diving
Air spaces within the skull that are in contact with ambient pressure through openings into the back of the nasal passages.
Vasoconstriction
Sports; Scuba diving
The constriction of the blood vessels in order to reduce heat loss from the blood through the skin.
Multilevel diving
Sports; Scuba diving
Spending a period of time at several different depth on a single dive.
