Page 24 - Petrophysics 2E

UNITS

Units of Area
acre = 43,540 ft2 = 4046.9 m2
ft2 = 0.0929 m2
hectare = 10,000 m2

Constants
Darcy = 0.9869 mm2
Gas constant = 82.05 (atm x cm3)/(g mol x K)
= 10.732 (psi x ft3)/(lb mol x OR)
= 0.729 (atm x ft3)/(lb mol x OR)
Mol. wt. of air = 28.97

Units of Length
Angstrom = 1 x IO-' cm
cm = 0.3937 in.
ft = 30.481 cm
in. = 2.540 cm
km = 0.6214 mile
m = 39.370 in. = 3.2808 ft

Units of Pressure
atm = 760 mm Hg (OOC) = 29.921 in. Hg = 14.696 psi
atm = 33.899 ft water at 4°C
bar = 14.5033 psi = 0.987 atm = 0.1 MPa
dyne/cm2 = 6.895 kPa (kilopascal)
ft water = 0.4912 psi
kg(force)/cm2 = 14.223 psi
psi = 2.036 in. Hg (OOC) = 6.895 kPa

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