Centimetre of water

Centimetre Of Water

Centimetre of water

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A centimetre of water (US spelling centimeter of water, abbreviated cmH<sub>2</sub>O) is a less commonly used unit of pressure derived from pressure head calculations using metrology. It is frequently used to measure the central venous pressure, the intracranial pressure while sampling cerebrospinal fluid, as well as determining pressures during mechanical ventilation or in water supply networks (then usually in metres water column). It is also a common unit of pressure in the speech sciences.

It is defined as the pressure exerted by a column of water of 1 cm in height at 4 °C (temperature of maximum density) at the standard acceleration of gravity.

This unit is commonly used to specify the pressure to which a CPAP machine is set after a polysomnogram.

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