How many psia in 1 psig?
The answer is 1.
We assume you are converting between pound/square inch [absolute] and pound/square inch [gauge].
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psia or psig
The SI derived unit for pressure is the pascal.
1 pascal is equal to 0.000145037738007 psia, or 0.000145037738007 psig.
Note that rounding errors may occur, so always check the results.
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Pounds per square inch absolute (psia) is used to make it clear that the pressure is relative to a vacuum rather than the ambient atmospheric pressure. Since atmospheric pressure at sea level is around 14.7 psi, this will be added to any pressure reading made in air at sea level.
Psig (pound-force per square inch gauge) is a unit of pressure relative to the surrounding atmosphere. By contrast, psia measures pressure relative to a vacuum (such as that in space). At sea level, Earth's atmosphere actually exerts a pressure of 14.7 psi. Humans do not feel this pressure because internal pressure of liquid in their bodies matches the external pressure. If a pressure gauge is calibrated to read zero in space, then at sea level on Earth it would read 14.7 psi. Thus a reading of 30 psig on a tire gauge represents an absolute pressure of 44.7 psi.
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