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psia is pounds per square inch absolute, that is it includes atmospheric pressure. psig is the reading you get on a gauge and is atmospheric pressure (14.7 psi) less. psi is just pounds per square inch and it is appropriate to use this when one is talking about pressure difference.

It's essentially just the differences in the base point you're starting from. psia is absolute and measured as absolute pressure, whereas psig is gauge pressure, which is just the difference between the measured pressure and atmospheric pressure.

In my experience, psi is generally gauge pressure.

Psia Pressure

Psia Vs Psig

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what's different between psi,psia and psig?

i'm so confuse about this 3 pressure units .. pls explain for me . Thanks a lot

psi is a pressure unit and it means amount of pound force that exerts on square inches of earea and in fact it is synopsis of poundforce per square inch.

there are two types of pressures that we may concern: gauge pressure and absolute pressure.

when you compare the magnitude of pressure with the ambient pressure in fact it is a gauge pressure.

when you tell it without any relation with ambient (atmosphereic pressure) it is the absolute pressure.

psia means absolute pressure and psig means gauge pressure.

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psipsia psig

psi is pound per square inch pressure

psia is pound per square inch absolute (in respect to absolute vacuum)

psig is pound per square inch gage (indicated differential pressure between ambient pressure and the measured pressure)

all those units are outdated. Today the international units of pressure are (Pascal) Pa, hPa and Bar

The suffix absolute or gage should never added into the dimensional unit.

Use it as follows: Absolute pressure = 5 bar

Differential pressure = 4 bar