1 lb per square inch (psi) equals what in inches of water column (WC)?

To understand how 1 pound per square inch (psi) translates to inches of water column (WC), it is essential to recognize the relationship between these two units of pressure.

One psi is defined as the pressure resulting from a force of one pound applied to an area of one square inch. On the other hand, inches of water column is a measurement that represents the height of a column of water that exerts a certain amount of pressure.

The conversion factor between psi and inches of water column is based on the density of water. Specifically, 1 psi is equivalent to approximately 27.7 inches of water column. This conversion comes from the standard value of the density of water, which is approximately 62.4 pounds per cubic foot. By using the relationship of pressure (P = density × g × height), one can derive that 1 psi = 27.7 inches of WC.

Thus, when determining the equivalent of 1 psi in inches of water column, the correct conversion results in 27.7 WC, validating the choice. This understanding is crucial for applications in fields such as HVAC, where pressures are often measured in both psi and inches of water column.