2007-07-15 02:50:35 · 3 answers · asked by morrobless 1 in Science & Mathematics ➔ Physics
psia (pounds per square inch, absolute) is a measure of pressure and lb (pound) is a measure of total weight (mass times gravitation field). One lb of air, for example, can be pressurized in a cylinder to hundreds of psia with a pump.
Note, though, that saying things like "Put 35 lbs of air in the tires" is just a colloquialism. It really means pressurize the tires to 35 psi above the atmospheric pressure of 14 psia. That would be 49 psia.
2007-07-15 05:19:52 · answer #1 · answered by Dr. R 7 · 0⤊ 0⤋
1lb of air is a mass (an amount) of air.
1 psia (Absolute pressure), is the pressure exerted by a 1lb mass on 1 square inch of a surface and is 1 psi higher than 0 psig. (Gauge pressure).
e.g. Atmospheric pressure = 14.7 pounds acting on each square inch of the earth's surface at sea level and is indicated as 14.7 psia (= 0 psig).
Increase the atmospheric pressure by 1 psi = 15.7 psia
= 1 psig).
2007-07-15 06:31:22 · answer #2 · answered by Norrie 7 · 1⤊ 0⤋
One is a measure of weight the other a measure of pressure.
2007-07-15 02:53:34 · answer #3 · answered by Steiner 6 · 0⤊ 0⤋