14.7 psia represents standard atmospheric pressure, or 1 atm. PSIA is just psi with atmospheric pressure taken into account also.
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psia=psig+atmospheric pressure where, atmospheric pressure = 14.7psi therefore psig=psia-atmospheric pressure psig=100-14.7 psig=85.3psig
psia to psig psig - 15 15 - 15= 0 psig
70 psig
PSIA is Atmospheric pressure determined by what sea level you're at it will differ its weird how it works 30 PSIA is like 15 PSI, that's not exact so don't go by cutting the numbers in half I'll get back to you on the specifics PSI is read just like a tire
psig