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First stage

Regulator attached to the scuba tank that lowers the tank pressure to ambient pressure plus a pre-determined pressure (e.g., ambient + 140 psi).

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  • Part of Speech: noun
  • Synonym(s):
  • Blossary:
  • Industry/Domain: Sports
  • Category: Scuba diving
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Related terms

first stage
Sports; Scuba diving

Regulator attached to the scuba tank that lowers the tank pressure to ambient pressure plus a pre-determined pressure (e.g., ambient + 140 psi).

first stage capital
Financial services; Financial instruments

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Animals; Crustaceans

The first of three free-swimming larval stages of a true lobster; corresponds to the mysis stage of a penaeid shrimp.

first stage regulator
Natural environment; Coral reefs

Attached to the scuba tank, the first stage regulator reduces the high tank pressure to an intermediate pressure of 100 to 150 psi above the surrounding water pressure.

first-stage regulator
Fire safety; Prevention & protection

A pressure regulator for LP-Gas vapor service designed to reduce pressure from the container to 10. 0 psig (69 kPag) or less.

first stage capital
Financial services; Venture capital

Money provided to entrepreneur who has a proven product, to start commercial production and marketing, not covering market expansion, de-risking, acquisition costs.

immersion hypothermia
Sports; Scuba diving

The lowering of body temperature when a diver is fully immersed in cold water without proper thermal protection.

hookah
Sports; Scuba diving

A surface-supplied compressed air apparatus, for use in shallow diving in calm waters. The air is delivered to one or more divers through a long hose.

rebreather
Sports; Scuba diving

A closed-circuit system which filters exhaled air, then recirculates it for rebreathing by the diver; requires special training and maintenance.

high pressure nervous syndrome (HPNS)
Sports; Scuba diving

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 ...

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.

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