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Pressure sensors can alternatively be called pressure transducers, pressure transmitters, pressure senders, pressure indicators, piezometers and manometers, among other names. Pressure is an expression of the force required to stop a fluid from expanding, and is usually stated in terms of force per unit area.
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An open (differential) mercury pressure gauge. A mercury pressure gauge is a type of manometer using mercury as the working fluid. The most basic form of this instrument is a U-shaped glass tube filled with mercury. More complex versions deal with very high pressure or have better means of filling with mercury.
Thirdly, they make gauges with scales that read in many different pressure units (the article only mentions two). Fourthly, I believe there are other manufacturers who make very similar gauges but don't use the trademarked Magnehelic brand name. Alex Holden 08:36, 24 March 2019 (UTC) I'm tagging this article as needing an expert.
All we are talking about is scale. a manometer is a pressure guage that measures the pressure by measureing the weight of the column of air above it based on a reference weight on top of the column pushing down, this can be acheived in many different design methods. Hence, all manometers are pressure guages but all pressure guages are not ...
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 ).
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