Water exhibits numerous anomalies. To explain the anomalies, various scenarios have been suggested. In accordance with the scenarios, progressive increase of surface tension with decreasing temperature is expected. But obvious experimental evidence of the second inflection point (SIP) anomaly was still missing. Recently, Hrubý et al. (J Phys Chem Lett, 11: 443, 2020) published a new experiment that provides room for further discussion about the existence of SIP in the supercooled water region. Our group used the capillary rise method and measured the surface tension of water down to − 32.27 °C. We will show in the paper that results of both experiments do not confirm the existence of SIP in the deeply supercooled water. But measurements for the very low temperatures show that it is not possible to recommend the extrapolated IAPWS formulation R1-76 (2014) below − 25 °C.

水呈现出许多异常现象。为了解释异常，已经提出了各种方案。根据情景，预计表面张力会随着温度的降低而逐渐增加。但是仍然缺少第二个拐点（SIP）异常的明显实验证据。最近，Hrubý 等人。(J Phys Chem Lett, 11: 443, 2020) 发表了一项新实验，为进一步讨论过冷水区域中 SIP 的存在提供了空间。我们小组使用毛细管上升法测量了低至 − 32.27 °C 的水的表面张力。我们将在论文中表明，这两个实验的结果都不能证实深过冷水中 SIP 的存在。