The surface tension of water changes with temperature due to the variation in the strength of hydrogen bonds between water molecules. As the temperature increases, the kinetic energy of the water molecules also increases, causing the hydrogen bonds to break more frequently. This results in a decrease in surface tension with increasing temperature.The relationship between surface tension and temperature T can be described by the following empirical equation: T = 1 - T - T where is the surface tension at a reference temperature T, and is the temperature coefficient of surface tension.The capillary rise method can be used to measure the surface tension of water at different temperatures. This method involves immersing a thin capillary tube into the liquid and observing the height to which the liquid rises due to surface tension. The surface tension can be calculated using the Jurin's law formula: = ghr / 2where is the density of the liquid, g is the acceleration due to gravity, h is the height of the liquid column, and r is the radius of the capillary tube.However, the capillary rise method may not be the most accurate method for measuring surface tension at varying temperatures, as it is sensitive to impurities and the cleanliness of the capillary tube. Additionally, the method assumes that the liquid wets the capillary tube completely, which may not always be the case.More accurate methods for measuring surface tension at different temperatures include the maximum bubble pressure method, the Wilhelmy plate method, and the drop weight method. These methods are less sensitive to impurities and provide more reliable results for the temperature dependence of surface tension.