Tuesday, 13 March 2012

Atmospheric pressure based on height of water

Atmospheric burden is generally abstinent with a mercury barometer, and a acme of about 760 millimetres (30 in) of mercury is generally acclimated to allegorize (and measure) atmospheric pressure. However, back mercury is not a actuality that bodies frequently appear in acquaintance with, baptize generally provides a added automatic way to anticipate the burden of one atmosphere.

One atmosphere (101 kPa or 14.7 psi) is the bulk of burden that can lift baptize about 10.3 m (34 ft). Thus, a diver 10.3 m underwater adventures a burden of about 2 atmospheres (1 atm of air additional 1 atm of water). This is additionally the best acme to which a cavalcade of baptize can be fatigued up by suction.

Low pressures such as accustomed gas curve are sometimes defined in inches of water, about accounting as w.c. (water column) or W.G. (inches baptize gauge). A archetypal gas application residential apparatus is rated for a best of 14 w.c., which is about 35 hPa.

In general, non-professional barometers are aneroid barometers or ache barometer based. See burden altitude for a description of barometers.

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