Scuba diving

Scuba diving

Underwater diving in which the diver uses scuba gears to breathe underwater.

Industry: Sports

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Scuba diving

Knot

Sports; Scuba diving

The velocity unit of 1 nautical mile (6080. 20 ft. ) per hour; equivalent to 1. 689 ft. per second: to convert ft. per sec. into knots, multiply by 0. 592.

High pressure nervous syndrome (HPNS)

A condition which results from breathing Helium under high pressures. Early symptoms of HPNS are sometimes seen as shallow as 300FSW but more commonly over 600FSW. The severity also depends on the ...

Breath-hold diving

Sports; Scuba diving

Diving without life support apparatus, while holding one's breath.

Windward

Sports; Scuba diving

A point or side from which the wind blows; in the direction from which the wind blows; as opposed to, leeward.

Gauge pressure

Sports; Scuba diving

Pressure exclusive of atmospheric pressure, when diving, gauge pressure is due to the water pressure.

Air

Sports; Scuba diving

A gas mixture containing 21% oxygen, 78% nitrogen, and 1% other gases (mainly argon); compressed air is used for recreational scuba diving.

Atmosphere absolute

Sports; Scuba diving

The ambient pressure including the air column over the water. The air column = 1 atm. at sea level. In sea water, another atmosphere is added each 33 FSW (Feet of Sea Water) . There is an ...