In this sample convert 5 atmospheres to feet of water.

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An atmosphere is a measure of pressure (force) being exerted on an area equal to the force exerted on an object by earth’s atmosphere as gravity pulls down on molecules of air. Although earth’s atmosphere exerts a force varying by altitude and other factors the unit of measure has been defined to a standard of 101.325 kPa (more details on atmospheres available). Force exerted by the atmosphere effects the height of fluids in a column depending on the compressibility of that fluid. Two fluids commonly used in columns to measure pressure are water, as described below, and mercury.

How can 5 atmospheres of pressure be converted to feet of water?

From a lookup table we can retrieve the conversion factor necessary to convert a single atmosphere to feet of water.

In fairly approximate terms the conversion factor is 33.9.

Multiply the know value of atmospheres (5) by the conversion factor (33.9) to get the answer in feet of water (?).

**5 atm x 33.9**

**=169.5 ftH _{2}O**