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The bar is a metric unit of pressure defined as 100,000 Pa (100 kPa), though not part of the International System of Units (SI). A pressure of 1 bar is slightly less than the current average atmospheric pressure on Earth at sea level (approximately 1.013 bar).
The outside water pressure increases with depth and so the stresses on the hull also increase with depth. Each 10 metres (33 ft) of depth puts another atmosphere (1 bar, 14.7 psi, 101 kPa) of pressure on the hull, so at 300 metres (1,000 ft), the hull is withstanding thirty standard atmospheres (30 bar; 440 psi; 3,000 kPa) of water pressure.
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. [1] [2]The unit used in the US is the foot sea water (fsw), based on standard gravity and a sea-water density of 64 lb/ft 3.
20 MPa 2,900 psi Typical pressure used for hydrogenolysis reactions [70] 21 MPa 3,000 psi Pressure of a typical aluminium scuba tank of pressurized air (210 bar) [71] 21 MPa 3,000 psi Ballistic pressure exerted as high-power bullet strikes a solid bulletproof object [citation needed] 22 MPa 3,200 psi Critical pressure of water 28 MPa 4,100 psi
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Therefore, a 20 bar watch is equivalent to a 200-meter watch. Some watches are rated in atmospheres (atm), which are about 1% greater than bars. In the United Kingdom, scuba divers and others often use the word atmosphere interchangeably with bar (1 atm = 1.01325 bar, or 101,325 Pa).
In which pO 2 is the chosen maximum partial pressure in oxygen in bar and the FO 2 is the fraction of oxygen in the mixture. For example, if a gas contains 36% oxygen and the maximum pO 2 is 1.4 bar, the MOD (msw) is 10 msw/bar x [(1.4 bar / 0.36) − 1] = 28.9 msw.
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