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2. Inch of water - Wikipedia

   en.wikipedia.org/wiki/Inch_of_water

   It is defined as the pressure exerted by a column of water of 1 inch in height at defined conditions. At a temperature of 4 °C (39.2 °F) pure water has its highest density (1000 kg/m 3). At that temperature and assuming the standard acceleration of gravity, 1 inAq is approximately 249.082 pascals (0.0361263 psi). [2]

3. Pressure measurement - Wikipedia

   en.wikipedia.org/wiki/Pressure_measurement

   For low pressure differences, light oil or water are commonly used (the latter giving rise to units of measurement such as inches water gauge and millimetres H 2 O). Liquid-column pressure gauges have a highly linear calibration. They have poor dynamic response because the fluid in the column may react slowly to a pressure change.

4. Pound per square inch - Wikipedia

   en.wikipedia.org/wiki/Pound_per_square_inch

   Since atmospheric pressure at sea level is around 14.7 psi (101 kilopascals), this will be added to any pressure reading made in air at sea level. The converse is pound per square inch gauge (psig), indicating that the pressure is relative to atmospheric pressure. For example, a bicycle tire pumped up to 65 psig in a local atmospheric pressure ...

5. Bar (unit) - Wikipedia

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

   Map showing atmospheric pressure in mbar or hPa A tire-pressure gauge displaying bar (outside) and pounds per square inch (inside) Atmospheric air pressure where standard atmospheric pressure is defined as 1013.25 mbar, 101.325 kPa, 1.01325 bar, which is about 14.7 pounds per square inch.

6. Pressure - Wikipedia

   en.wikipedia.org/wiki/Pressure

   For instance, if the atmospheric pressure is 100 kPa (15 psi), a gas (such as helium) at 200 kPa (29 psi) (gauge) (300 kPa or 44 psi [absolute]) is 50% denser than the same gas at 100 kPa (15 psi) (gauge) (200 kPa or 29 psi [absolute]). Focusing on gauge values, one might erroneously conclude the first sample had twice the density of the second ...

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