page_title: Metre sea water
hierarchical_section_title: Metre sea water
caption_attribution_description: Español: Manómetro de la cámara (compartimento) de la cámara hiperbárica. English: Chamber pressure gauge for hyperbatic chamber
context_page_description: The metre sea water is a metric unit of pressure used in underwater diving. It is defined as one tenth of a bar.
  The unit used in the US is the foot sea water, based on standard gravity and a sea-water density of 64 lb/ft³. According to the US Navy Diving Manual, one fsw equals 0.30643 msw, 0.030643 bar, or 0.44444 psi, though elsewhere it states that 33 fsw is 14.7 psi, which gives one fsw equal to about 0.445 psi.
  The msw and fsw are the conventional units for measurement of diver pressure exposure used in decompression tables and the unit of calibration for pneumofathometers and hyperbaric chamber pressure gauges.
context_section_description: The metre (or meter) sea water (msw) is a metric unit of pressure used in underwater diving. It is defined as one tenth of a bar.
  The unit used in the US is the foot sea water (fsw), based on standard gravity and a sea-water density of 64 lb/ft³. According to the US Navy Diving Manual, one fsw equals 0.30643 msw, 0.030643 bar, or 0.44444 psi, though elsewhere it states that 33 fsw is 14.7 psi (one atmosphere), which gives one fsw equal to about 0.445 psi.
  The msw and fsw are the conventional units for measurement of diver pressure exposure used in decompression tables and the unit of calibration for pneumofathometers and hyperbaric chamber pressure gauges.
caption: Hyperbaric chamber pressure gauge calibrated in msw and bar
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