What is equivalent to 28 inches of Water Column (W.C.)?

To understand why 28 inches of Water Column (W.C.) is equivalent to 1 PSIG, we can start by converting inches of water column to pounds per square inch (PSI), specifically for the context of gas pressure measurement.

Water column is often used in HVAC and gas measurements to quantify gas pressure in systems. The conversion factor between inches of water and PSI is approximately 27.68 inches of water equals 1 PSI. Therefore, to convert 28 inches of W.C. into PSI, you would divide 28 by 27.68.

When you perform this calculation:

28 inches W.C. / 27.68 = approximately 1.01 PSI.

This value is rounded, and it shows that 28 inches of water column is indeed very close to 1 PSI, supporting the choice that the correct conversion is to 1 PSIG.

The other options are not appropriate equivalents for 28 inches of water column because they would suggest greater pressure levels than what is represented by 28 inches of water column when converted to PSI. This reinforces the concept that each figure in the options must be based on accurate conversions related to pressure measurements. Thus, the selection of 1 PSIG as the equivalent for 28 inches of