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  2. Orders of magnitude (pressure) - Wikipedia

    en.wikipedia.org/wiki/Orders_of_magnitude_(pressure)

    Pressure due to direct impact of a strong breeze (~28 mph or 45 km/h) [27] [28] [31] 120 Pa Pressure from the weight of a U.S. quarter lying flat [32] [33] 133 Pa 1 torr ≈ 1 mmHg [34] ±200 Pa ~140 dB: Threshold of pain pressure level for sound where prolonged exposure may lead to hearing loss [citation needed] ±300 Pa ±0.043 psi

  3. Recreational Dive Planner - Wikipedia

    en.wikipedia.org/wiki/Recreational_Dive_Planner

    RDPs are almost always used in conjunction with dive log books to record and monitor pressure depth and residual nitrogen levels. The low price and convenience of many modern dive computers mean that many recreational divers only use tables such as the RDP for a short time during training before moving on to use a diving computer. Dive ...

  4. Diving cylinder - Wikipedia

    en.wikipedia.org/wiki/Diving_cylinder

    Ambient pressure (P A) is the surrounding water pressure at a given depth and is made up of the sum of the hydrostatic pressure and the air pressure at the surface. It is calculated as (2) P A = D×g×ρ + atmospheric pressure [81] with D = depth g = Standard gravity ρ = water density. in a consistent system of units

  5. Saturation diving - Wikipedia

    en.wikipedia.org/wiki/Saturation_diving

    Bell operations and lockouts may also be done at between 0.4 and 0.6 bar oxygen partial pressure, but often use a higher partial pressure of oxygen, between 0.6 and 0.9 bar, [38] which lessens the effect of pressure variation due to excursions away from holding pressure, thereby reducing the amount and probability of bubble formation due to ...

  6. Centimetre or millimetre of water - Wikipedia

    en.wikipedia.org/wiki/Centimetre_or_millimetre...

    A centimetre of water [1] is a unit of pressure. It may be defined as the pressure exerted by a column of water of 1 cm in height at 4 °C (temperature of maximum density) at the standard acceleration of gravity, so that 1 cmH 2 O (4°C) = 999.9720 kg/m 3 × 9.80665 m/s 2 × 1 cm = 98.063754138 Pa ≈ 98.0638 Pa, but conventionally a nominal maximum water density of 1000 kg/m 3 is used, giving ...

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  9. Hydraulic head - Wikipedia

    en.wikipedia.org/wiki/Hydraulic_head

    In an example with a 400 m deep piezometer, with an elevation of 1000 m, and a depth to water of 100 m: z = 600 m, ψ = 300 m, and h = 900 m. The pressure head can be expressed as: = = where is the gauge pressure (Force per unit area, often Pa or psi),