# Gas/Water Interfacial Tension

## Gas/Water Interfacial Tension

Gas/Water Interfacial Tension correlation was published by Baker and Swerdloff in 1956.

Gas/Water Interfacial Tension correlation in the PVT software at pengtools.com

## Math and Physics

$\sigma_{74} =75 - 1.108P^{0.349}$
$\sigma_{280} =53-0.1048P^{0.637}$
$At\ T<74F,\ \sigma_w=\sigma_{74}$
$At\ 74F
$At\ T>280F,\ \sigma_w=\sigma_{280}$

## Nomenclature

$P$ = pressure, psia
$\sigma_w$ = gas/water interfacial tension, dynes/cm
$T$ = temperature, °F

Gas/Oil Interfacial Tension
Gas/Water Interfacial Tension
Water bubble point pressure
Water compressibility
Water density
Water formation volume factor
Water salinity from density equation
Water solids concentration
Water viscosity

## References

Baker, O. and Swerdloff, W. 1955. Calculation of Surface Tension 3—Calculating parachor Values. Oil Gas J. (5 December 1955): 141.
Baker, O. and Swerdloff, W. 1956. Calculation of Surface Tension 6—Finding Surface Tension of Hydrocarbon Liquids. Oil Gas J. (2 January 1956): 125.