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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.
The pressure across the test piece is typically measured with a U tube manometer while, for increased sensitivity and accuracy, the pressure difference across the metering element is measured with an inclined manometer. One end of each manometer is connected to its respective plenum chamber while the other is open to the atmosphere.
The pressure in this smaller volume is then measured by a mercury manometer, and knowing the compression ratio (the ratio of the initial and final volumes), the pressure of the original vacuum can be determined by applying Boyle's law. This method is fairly accurate for non-condensable gases, such as oxygen and nitrogen.
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.
manometer: pressure of gas mass flow meter: mass flow rate of a fluid travelling through a tube mass spectrometer: masses of ions, used to identify chemical substances through their mass spectra measuring cup: liquid and dry goods measuring cylinder: volume measuring spoon: a spoon used to measure an amount of an ingredient, either liquid or ...
A Knudsen manometer uses this temperature-effect to make a plate with dual temperatures rotate. It consists of a rotating plate, of which the centre of rotation is in the centre of the plate. Image the plate rotating, the parts that push the 'air' are the plate parts that are 'normal' temperature, the other sides are heated.
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