Assume the atmospheric pressure at our location is 1 atmosphere absolute. (a). U

Question

Assume the atmospheric pressure at our location is 1 atmosphere absolute. (a). Using the Lecture 1 guidance for significant figures in calculations, what is the equivalent pressure in psia, bar(a), and kg/cm2(a)? Note that the last measure uses what is still a common pressure measurement around the world. It goes with the kilogram force measure that would say my weight is about 85 kilos instead of 187 lbf.

Common errors in this course are to equate the numerical values of bar and atmosphere and miscalculate conversions to/from kPa (kilo-Pascals) or MPa (Mega-Pascals) and to/from vacuum pressures. (b). A measurement of 10.0 atm(g) = 147 psig is equivalent to what bar(g) and what MPa(g)? (c). A value of 1.00 bar(a) is equal to what gauge measurements in psi and mmHg?

Explanation / Answer

1 atm(a) = 1.013 bar(a) = 760 mmHg

1 atm(a) = 14.6959 psia

1 atm(a) = 1.03323 kgf/cm2

10 atm(g) = 10.1325 bar(g)

1 bar(a) = -0.013 bar(g) = -0.1910473 psig = -9.75 mmHg

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