![]() Thus a reading of 30 psig on a tire gauge represents an absolute pressure of 44.7 psi. If a pressure gauge is calibrated to read zero in space, then at sea level on Earth it would read 14.7 psi. Humans do not feel this pressure because internal pressure of liquid in their bodies matches the external pressure. At sea level, Earth's atmosphere actually exerts a pressure of 14.7 psi. ![]() By contrast, psia measures pressure relative to a vacuum (such as that in space). Psig (pound-force per square inch gauge) is a unit of pressure relative to the surrounding atmosphere. You can do the reverse unit conversion fromīar to psig, or enter any two units below: Enter two units to convert From:
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