Abstract
A possibility is studied of extending the range of action of the simple three-parameter formula (ITS-90 scale) proposed in the previous work of the author [2] for the dependence of saturation vapor pressure E on temperature T within the range of 250 to 490 K. The results demonstrated that the dependence ln[E(T)/E(T bas)] = (T - T bas)[A - B(T - T bas) + C(T - T bas)2]/T with four sets of coefficients A, B, and C obtained using one base temperature Tbas equal to the temperature of triple point of water T t = 273.16 K and two additional base values T bas2 = 473.16 K and T bas3 = 623.16 K makes it possible to approximate rather accurately the initial experimental and computed data in the temperature range from the point of homogeneous freezing of 235 K to the critical temperature of 647 K for liquid water and from 193 K to T t for ice. A procedure used for obtaining the inverse function T(E) by solving the third-degree algebraic equation is validated. A hypothesis is proposed for the physical substantiation of additional base points in the form of “a noticeable appearance of dimers at the point T bas2 and their 100% concentration at the temperature T bas3.”
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Original Russian Text © N.P. Romanov, 2017, published in Meteorologiya i Gidrologiya, 2017, No. 1, pp. 41-55.
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Romanov, N.P. A compact form for the analytic description of temperature dependence of saturation vapor pressure over plane surfaces of water and ice. Russ. Meteorol. Hydrol. 42, 27–37 (2017). https://doi.org/10.3103/S1068373917010046
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DOI: https://doi.org/10.3103/S1068373917010046