A pressure reading of 14.7 psia is equivalent to what value?

A pressure reading of 14.7 psia corresponds to the atmospheric pressure at sea level. When measuring pressure, two common units used are absolute pressure (psia) and gauge pressure (psig). Gauge pressure measures the pressure relative to atmospheric pressure, which means that at sea level, a pressure reading of 14.7 psia indicates that there is no additional pressure above atmospheric pressure. Therefore, the gauge pressure would be 0 psig; this is because the readings for psig do not account for atmospheric pressure.

Additionally, other choices such as 2.31 in W.C., 24.7 psig, and 27.78 in W.C. either represent pressures that are higher than atmospheric pressure or represent conversions that do not directly relate to 14.7 psia being measured at standard atmospheric conditions. Understanding these conversions and distinctions is key in the field of pressure measurement and plays an essential role in safety protocols and equipment calibration.