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宽广温度范围的水离子积是在理论上和实际应用上涉及面很广的重要物理化学性质之一.傅培鑫,Quist及Marshall等在总结实验数据的基础上提出了相应的计算水离子积的经验公式;Taylor还用热力学方法进行了计算.在饱和蒸气压及0～800℃范围内,以Marshall-Franck的经验公式准确度为最高,并由国际蒸气性质协会(IAPA)于1980年公布为计算宽广温度范围的水离子积公式.但是在温度较高(200～300℃)时,此公式的计算值与实验值之间的误差随温度升高而逐渐增大,平均误差为0.033pK_w单位.
Water ionization over a wide temperature range is one of the most important physico-chemical properties in theory and practice.Fu Peixin, Quist and Marshall proposed the corresponding experience in water ion volume calculation based on the experimental data Taylor was also calculated by thermodynamic method and the Marshall-Franck empirical formula was the highest at saturated vapor pressure and 0-800 ° C, and was published by the International Association of Vapor Properties (IAPA) in 1980 as a calculation However, at higher temperatures (200-300 ° C), the error between calculated and experimental values increases with increasing temperature, with an average error of 0.033pK_w units.