How many inches of water column are equivalent to one psig pressure?

One psig (pounds per square inch gauge) is approximately equivalent to 28 inches of water column. This relationship arises from the way pressure is defined in terms of weight exerted over an area. The water column is a common unit used to represent low-pressure systems, particularly in HVAC and gas systems.

To understand the conversion better, one can recall that water exerts pressure due to its weight. The pressure measuring devices, such as manometers, often utilize water column measurements. In practical terms, 1 psig translates to a column of water measuring 28 inches high. This is consistent with standard conversion factors used in fluid mechanics and gas pressure measurement. Therefore, knowing that one psig correlates to 28 inches of water column is crucial for technicians who need to gauge and convert different pressure measurements accurately.