The acronyms used in diving.

  • fsw – feet of seawater

    fsw or feet of seawater is a measurement unit of the imperial system and represent the pressure in 1 foot of seawater or about 15 psi. 33 feet is also roughly 1 atmosphere.

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  • Gauge pressure

    The gauge pressure is the pressure shown by a gauge which was calibrated and zeroed using ambient surface pressure at sea level as a reference.

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  • HPNS – High Pressure Neurological Syndrome

    HPNS or High Pressure Neurological Syndrome occurs on very deep dive usually past 100m and it affect the central nervous system. Syndromes include tremors, spasms, paralysie. Little is know on the physiological mechanics of HPNS.

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