water gauge
/ˈwɔːtə ɡeɪdʒ/(US water gage)
noun
1A gauge for measuring the depth or some other property of water.
2A gauge that shows the pressure of a gas or vapour relative to ambient atmospheric pressure, typically by means of a U-shaped tube where the difference in the height of the water in the two arms indicates the pressure difference between them.
- A pressure of, e.g., 2 cm water gauge means a pressure in excess of atmospheric pressure equal to that of a column of water 2 cm high. One cm water gauge is approx. equal to 98 pascals, 0.98 millibar, and 0.014 p.s.i..
Origin
Late 17th century; earliest use found in Robert Plot (bap. 1640, d. 1696), naturalist and antiquary. From water + gauge.
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