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2. Pressure measurement - Wikipedia

   en.wikipedia.org/wiki/Pressure_measurement

   In the following illustrations of a compound gauge (vacuum and gauge pressure), the case and window has been removed to show only the dial, pointer and process connection. This particular gauge is a combination vacuum and pressure gauge used for automotive diagnosis: Indicator front with pointer and dial Mechanical side with Bourdon tube

3. Torricelli's experiment - Wikipedia

   en.wikipedia.org/wiki/Torricelli's_experiment

   Torricelli concluded that the mercury fluid in the tube is aided by the atmospheric pressure that is present on the surface of mercury fluid on the dish. He also stated that the changes of liquid level from day to day are caused by the variation of atmospheric pressure. The empty space in the tube is called the Torricellian vacuum. [3] 760 mmHg ...

4. Vacuum - Wikipedia

   en.wikipedia.org/wiki/Vacuum

   Pressure range Definition The reasoning for the definition of the ranges is as follows (typical circumstances): Prevailing atmospheric pressure (31 kPa to 110 kPa) to 100 Pa low (rough) vacuum Pressure can be achieved by simple materials (e.g. regular steel) and positive displacement vacuum pumps; viscous flow regime for gases

5. Bernoulli's principle - Wikipedia

   en.wikipedia.org/wiki/Bernoulli's_principle

   For example, if the air flowing past the top surface of an aircraft wing is moving faster than the air flowing past the bottom surface, then Bernoulli's principle implies that the pressure on the surfaces of the wing will be lower above than below. This pressure difference results in an upwards lifting force.

6. Ultra-high vacuum - Wikipedia

   en.wikipedia.org/wiki/Ultra-high_vacuum

   Measurement of high vacuum is done using a nonabsolute gauge that measures a pressure-related property of the vacuum. See, for example, Pacey. [2] These gauges must be calibrated. [3] The gauges capable of measuring the lowest pressures are magnetic gauges based upon the pressure dependence of the current in a spontaneous gas discharge in ...

7. Pressure - Wikipedia

   en.wikipedia.org/wiki/Pressure

   In non-SI technical work, a gauge pressure of 32 psi (220 kPa) is sometimes written as "32 psig", and an absolute pressure as "32 psia", though the other methods explained above that avoid attaching characters to the unit of pressure are preferred. [10] Gauge pressure is the relevant measure of pressure wherever one is interested in the stress ...

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9. Orders of magnitude (pressure) - Wikipedia

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

   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 Lung air pressure difference moving the normal breaths of a person (only 0.3% of standard atmospheric ...