Surface Tension of Aqueous Solutions of Diethanolamine and Triethanolamine from 25 °C to 50 °C

The surface tension of aqueous solutions of diethanolamine and triethanolamine was measured over the entire concentration range at temperatures of 25 °C to 50 °C. The experimental values were correlated with temperature and with mole fraction. The maximum deviation was in both cases always less than 0.5%.