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2. Tire-pressure gauge - Wikipedia

   en.wikipedia.org/wiki/Tire-pressure_gauge

   Dial gauges feature a round dial with a needle that moves to indicate the tire pressure. The pressure is usually displayed in pounds per square inch (PSI), bar, or kilopascals (kPa). Dial gauges are known for their durability and ease of use. Pen-type gauges are compact gauges that resemble a pen and have a small dial or scale for reading ...

3. Pressure measurement - Wikipedia

   en.wikipedia.org/wiki/Pressure_measurement

   The most common ion gauge is the hot-cathode Bayard–Alpert gauge, with a small ion collector inside the grid. A glass envelope with an opening to the vacuum can surround the electrodes, but usually the nude gauge is inserted in the vacuum chamber directly, the pins being fed through a ceramic plate in the wall of the chamber.

4. Pound per square inch - Wikipedia

   en.wikipedia.org/wiki/Pound_per_square_inch

   In SI units, 1 psi is approximately 6,895 pascals. The pound per square inch absolute (psia) is used to make it clear that the pressure is relative to a vacuum rather than the ambient atmospheric pressure. 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 ...

5. 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]

6. Mercury pressure gauge - Wikipedia

   en.wikipedia.org/wiki/Mercury_pressure_gauge

   Further, the vacuum in the gauge eventually deteriorates due to slow diffusion of gases through the mercury, making the device inaccurate. [8] In 1938, Adolph Zimmerli (1886–1967) [9] invented a gauge that overcame the filling problems, at least for pressures below ambient pressure. [10] Zimmerli's gauge consists of three relatively wide columns.

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