What unit is used to measure the pressure from the first stage of a propane regulator?

The correct unit for measuring the pressure from the first stage of a propane regulator is psig, which stands for pounds per square inch gauge. This measurement reflects the pressure of the gas as it leaves the first stage of the regulator, indicating how much pressure is available for use in the system.

Psig is commonly used in gas-related applications because it provides a standardized way of expressing pressure relative to atmospheric pressure, making it easier to assess the operational conditions in a system. Regulating propane pressure accurately is crucial for both safety and performance, especially in RVs where the proper function of appliances reliant on propane is essential.

In contrast, inches of water column, while it is also a unit of pressure measurement, is more frequently used for lower pressure measurements or for devices that require very precise pressure control, such as in ventilation systems. The other units, feet per minute and meters per second, are measures of velocity, not pressure, and are therefore not applicable in this context.