Gauge pressure Most pressure gauges compare to Atmospheric (i.e. this room is at 0 Gauge) Absolute p is 1 atm more P = P gauge + 1 atm 1 atm = 1.013 x.

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Presentation transcript:

Gauge pressure Most pressure gauges compare to Atmospheric (i.e. this room is at 0 Gauge) Absolute p is 1 atm more P = P gauge + 1 atm 1 atm = x 10 5 Pa = kPa = 760 Torr = 14.7 psi

Example – What is the absolute pressure (In Torr and Pa) if you have a gauge pressure of 312 Torr? = 1072 Torr absolute (1.013 x10 5 Pa/atm)(1072 Torr)/(760 Torr/atm) = 1.43E5 Pa 1072 Torr absolute 1.43E5 Pa

P = P gauge + 1 atm P = 35 psi psi = 49.7 psi 1.013E5*49.7/14.7 = 3.42E5 Pa 49.7 psi, 3.42E5 Pa What is the absolute pressure if you read 35 psi gauge? Answer in psi (1 atm = 14.7 psi) and Pascals

P = P gauge + 1 atm 812 = P gauge Torr P gauge = 52 Torr 52 Torr If you have an absolute pressure of 812 Torr, what is the gauge pressure? Answer in Torr (1 atm = 760 Torr)

P = P gauge + 1 atm P = 2.17 x 10 5 Pa x 10 5 Pa 3.18 x 10 5 Pa What is the absolute pressure if the gauge pressure is 2.17 x 10 5 Pa (1 atm = x 10 5 Pa = kPa)

P = P gauge + 1 atm 42.0 kPa = p gauge kPa kPa If you have an absolute pressure of 42.0 kPa, what is the gauge pressure in kPa? (1 atm = x 10 5 Pa = kPa)