Document Download: R1-76(2014): Revised Release on the Surface Tension of Ordinary Water Substance

Description

This formulation is recommended for the calculation of the surface tension of ordinary water in equilibrium with pure water vapor. 
The region of validity the entire vapor-liquid saturation curve, from the triple point to the critical point. It also provides reasonable results when extrapolated to metastable (supercooled) conditions, down to at least −25 °C.

Online calculation

The Russian National Committee of IAPWS (through Moscow Power Engineering Institute) has provided an online calculation page, which may be useful in program development and verification. Note that IAPWS is not responsible for the content of these online calculation pages.

Revision History

• This Release was originally adopted by IAPWS in 1976, and was adjusted in 1994 to conform to the International Temperature Scale of 1990.
• It was revised in 2014 to add a statement about extrapolation to supercooled conditions; the formulation itself remained unchanged.

This Release is the product of the Working Group "Thermophysical Properties of Water and Steam" (TPWS) of the International Association for the Properties of Water and Steam (IAPWS).