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2. Bar (unit) - Wikipedia

   en.wikipedia.org/wiki/Bar_(unit)

   The usage is deprecated but still prevails in the oil industry (often by capitalized "BarG" and "BarA"). As gauge pressure is relative to the current ambient pressure, which may vary in absolute terms by about 50 mbar, "BarG" and "BarA" are not interconvertible. Fuller descriptions such as "gauge pressure of 2 bars" or "2-bar gauge" are ...

3. Pressure Equipment Directive (EU) - Wikipedia

   en.wikipedia.org/wiki/Pressure_Equipment...

   The Pressure Equipment Directive (PED) 2014/68/EU (formerly 97/23/EC) [1] of the EU sets out the standards for the design and fabrication of pressure equipment ("pressure equipment" means steam boilers, pressure vessels, piping, safety valves and other components and assemblies subject to pressure loading) generally over one liter in volume and having a maximum pressure more than 0.5 bar gauge.

4. Pressure measurement - Wikipedia

   en.wikipedia.org/wiki/Pressure_measurement

   Gauge pressure is zero-referenced against ambient air pressure, so it is equal to absolute pressure minus atmospheric pressure. A tire pressure gauge is an example of gauge pressure measurement; when it indicates zero, then the pressure it is measuring is the same as the ambient pressure.

5. Orders of magnitude (pressure) - Wikipedia

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

   ±0.043 psi Lung air pressure difference moving the normal breaths of a person (only 0.3% of standard atmospheric pressure) [35] [36] 400–900 Pa 0.06–0.13 psi Atmospheric pressure on Mars, < 1% of atmospheric sea-level pressure on Earth [37] 610 Pa 0.089 psi Partial vapor pressure at the triple point of water (611.657 Pa) [38] [39] 10 3 Pa

6. Kilogram-force per square centimetre - Wikipedia

   en.wikipedia.org/wiki/Kilogram-force_per_square...

   Use of the kilogram-force per square centimetre continues primarily due to older pressure measurement devices still in use. This use of the unit of pressure provides an intuitive understanding for how a body's mass , in contexts with roughly standard gravity , can apply force to a scale's surface area , i.e. kilogram-force per square (centi ...

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