Psia vs. Psig
Psia vs. Psig
(OP)
Can someone please tell me the difference between gauge pressure and atmospheric? Psig vs. Psia. In laymen terms.
Thank you
Thank you
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RE: Psia vs. Psig
psig is gage pressure
At sea level one feels 14.7 psia or 0 psig. A typical presure messuring device measures pressure compared to atmospheric pressure, hence psig.
RE: Psia vs. Psig
RE: Psia vs. Psig
PSIA is pounds per square inch absolute, NOT pounds per square inch atmospheric.
Jack M. Kleinfeld, P.E. Kleinfeld Technical Services, Inc.
Infrared Thermography, Finite Element Analysis, Process Engineering
www.KleinfeldTechnical.com
RE: Psia vs. Psig
JKEngineer's point is very important.
Answering your question as asked:
atmospheric pressure is a specific pressure.
i.e.: has a determined value of
0.0 psig = 14.69 psia = 1 atm
AT SEA LEVEL!
The question should have been: what is the difference between GAUGE and ABSOLUTE pressure?
1 atm is the atmospheric pressure at sea level.
Then:
0.0 psia = -14.69 psig (absolute vacuum)
also
psia = psig + 14.69psia
in layman terms:
the absolute pressure (psia) =
the pressure measured by a pressure gage (psig)
+
the atmospheric pressure in psi at that location (psia), at sea level the atmospheric pressure = 14.69psia.
HTH
Saludos.
a.