Inch of water

Inch of water

Inches of water, inAq, "Aq or inH20 is a non-SI unit for pressure. It is used for measuring small pressure differences across an orifice, or in a pipeline or shaft. [ [http://www.npl.co.uk/pressure/faqs/ohnoinches.html Inches of something] ]

It is defined as the pressure exerted by a column of water of 1 inch in height at defined conditions for example 39 °F (4 °C) at the standard acceleration of gravity; 1 inAq is approximately equal to 250 pascals at 0 °C.

Alternative standard conditions in common usage are 60 °F, or 68 °F (20 °C)

Its most common usage is in the measurement of air ("wind") that supplies a pipe organ and is referred simply as "inches". Standard wind pressure in the organ is typically around 3 to 4 inches but some high-pressure stops can be on 25 inches or more.

It is also used in natural gas distribtuion for measuring utilization pressure (U.P.) which is typically between 6 and 7 inches or .25 psi.

1 inAq = .036126 psi, or 27.67936 inAq = 1 psi.

References


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  • Inch of water — Water Wa ter (w[add] t[ e]r), n. [AS. w[ae]ter; akin to OS. watar, OFries. wetir, weter, LG. & D. water, G. wasser, OHG. wazzar, Icel. vatn, Sw. vatten, Dan. vand, Goth. wat[=o], O. Slav. & Russ. voda, Gr. y dwr, Skr. udan water, ud to wet, and… …   The Collaborative International Dictionary of English

  • Inch of water — Inch Inch, n. [OE. inche, unche, AS. ynce, L. uncia the twelfth part, inch, ounce. See {Ounce} a weight.] [1913 Webster] 1. A measure of length, the twelfth part of a foot, commonly subdivided into halves, quarters, eights, sixteenths, etc., as… …   The Collaborative International Dictionary of English

  • inch of water column — (in WC)    a traditional unit of pressure, used in plumbing to describe both water and gas pressures. The conventional equivalent of one inch of water is 249.0889 pascals, which is 2.490 889 millibars, about 0.036 127 pounds per square inch (psi) …   Dictionary of units of measurement

  • inch of water gauge — (in wg or wg)    another common name for the inch of water column. The word gauge (or gage ) after a pressure reading indicates that the pressure stated is actually the difference between the absolute, or total, pressure and the air pressure at… …   Dictionary of units of measurement

  • inch of water — A measurement of rainfall. Flowing water: an indefinite term, without meaning in and of itself in the absence of extrinsic evidence indicating the kind of inch or the method of measurement. 56 Am J1st Wat § 4. In some jurisdictions, the amount of …   Ballentine's law dictionary

  • inch of water — noun a unit of pressure in the imperial system equal to approx. 249 pascals …  

  • water inch — Water Wa ter (w[add] t[ e]r), n. [AS. w[ae]ter; akin to OS. watar, OFries. wetir, weter, LG. & D. water, G. wasser, OHG. wazzar, Icel. vatn, Sw. vatten, Dan. vand, Goth. wat[=o], O. Slav. & Russ. voda, Gr. y dwr, Skr. udan water, ud to wet, and… …   The Collaborative International Dictionary of English

  • Water — Wa ter (w[add] t[ e]r), n. [AS. w[ae]ter; akin to OS. watar, OFries. wetir, weter, LG. & D. water, G. wasser, OHG. wazzar, Icel. vatn, Sw. vatten, Dan. vand, Goth. wat[=o], O. Slav. & Russ. voda, Gr. y dwr, Skr. udan water, ud to wet, and perhaps …   The Collaborative International Dictionary of English

  • Water of crystallization — Water Wa ter (w[add] t[ e]r), n. [AS. w[ae]ter; akin to OS. watar, OFries. wetir, weter, LG. & D. water, G. wasser, OHG. wazzar, Icel. vatn, Sw. vatten, Dan. vand, Goth. wat[=o], O. Slav. & Russ. voda, Gr. y dwr, Skr. udan water, ud to wet, and… …   The Collaborative International Dictionary of English

  • Water on the brain — Water Wa ter (w[add] t[ e]r), n. [AS. w[ae]ter; akin to OS. watar, OFries. wetir, weter, LG. & D. water, G. wasser, OHG. wazzar, Icel. vatn, Sw. vatten, Dan. vand, Goth. wat[=o], O. Slav. & Russ. voda, Gr. y dwr, Skr. udan water, ud to wet, and… …   The Collaborative International Dictionary of English

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