pressure gauge: Quick Facts

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Photos

Two types of pressure gauge(Left) A U-tube manometer, in which differential pressure is measured as the difference h between the high-pressure reading and the low-pressure reading, multiplied by the density of the liquid in the tube. (Right) A Bourdon-tube gauge, in which a coiled tube, flattened into the cross section shown and attached to a fixed block, is open to a pressurized fluid. The tube straightens slightly under pressure to a degree measured by a pointer.

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metal bellow gauge pressure Bourdon-tube gauge diaphragm vacuum gauge Pirani gauge McLeod gauge Bayard-Alpert gauge manometer pressure strain gauge Barometer sphygmomanometer bathythermograph radiation measurement particle accelerator psychological testing measurement system productivity clock

Key People

James Watt

James Watt

Scottish instrument maker and inventor

barometer. Antique Barometer with readout. Technology measurement, mathematics, measure atmospheric pressure

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