psia=psig+atmospheric pressure
where, atmospheric pressure = 14.7psi
therefore
psig=psia-atmospheric pressure
psig=100-14.7
psig=85.3psig
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psia to psig psig - 15 15 - 15= 0 psig
70 psig
psig
14.7 psia represents standard atmospheric pressure, or 1 atm. PSIA is just psi with atmospheric pressure taken into account also.
55 psig +15=70