The temperature course of the surface tension of supercooled water was suspected to exhibit an anomalous feature the so called second inflection point (SIP). Besides some theoretical and molecular simulation studies, this hypothesis was primarily supported by experimental data by P.T. Hacker1. Recently, the present group performed accurate surface tension measurements down to 26 deg C using a modified capillary rise technique2,3 which, in contrast to Hacker s data, showed no SIP anomaly. In order to confirm that the qualitatively different observations are not related to some fundamental phenomenon, we developed an experimental device employing basically the same method as Hacker with a horizontal capillary tube. New experimental data for the surface tension of supercooled water measured with the horizontal capillary setup down to 23 deg C are presented in this study. The new data show a very good agreement with the previous capillary rise measurements. It was confirmed that the temperature dependence of the surface tension is free of SIP in a temperature range from 23 deg C to 23 deg C and can be well represented by the IAPWS standard extrapolated below 0.01 deg C. However, a small systematic deviation from the IAPWS correlation can be seen at temperatures below 15 deg C.
Compounds
#
Formula
Name
1
H2O
water
Datasets
The table above is generated from the ThermoML associated json file (link above).
POMD and RXND refer to PureOrMixture and Reaction Datasets. The compound numbers are included in properties, variables, and phases, if specificied;
the numbers refer to the table of compounds on the left.