Is 10 PSIG greater than 10 PSIA?

To understand the relationship between PSIG (pounds per square inch gauge) and PSIA (pounds per square inch absolute), it's essential to recognize the definitions of these two pressure measurement types. PSIG measures the pressure relative to atmospheric pressure, whereas PSIA measures the pressure relative to a perfect vacuum.

At sea level, atmospheric pressure is approximately 14.7 PSI. Therefore, when comparing 10 PSIG and 10 PSIA, it becomes clear that if you have a pressure of 10 PSIG, it means the pressure is 10 PSI above atmospheric pressure. To convert PSIG to PSIA, you add the atmospheric pressure:

10 PSIG + 14.7 PSI (atmospheric pressure) = 24.7 PSIA.

This indicates that 10 PSIA is indeed greater than 10 PSIG by a significant margin, specifically by the difference of 14.7 PSI. The understanding of these two measurements is crucial in industrial applications, especially in refrigeration, where pressures are often monitored and controlled for safety and efficiency. Thus, the correct assertion is that 10 PSIA is greater than 10 PSIG by about 14.7 PSI.