This equation was obtained in 1955 by Yu. I. Shimansky, at first
empirically, and later derived theoretically. The Shimansky equation does not contain any arbitrary
constants, since the value of TC can be determined experimentally and L0 can be calculated if L has been measured experimentally for at least one given value of temperature T. The Shimansky equation describes quite well the heat of vaporization for a wide variety of
liquids. For
chemical compounds that belong to the same class (e.g.
alcohols) the value of ratio remains constant. For each such class of liquids, the Shimansky equation can be re-written in a form of
where
The latter formula is a mathematical expression of structural similarity of liquids. The value of TC plays a role of the parameter for a group of curves of temperature dependence of L.
Sources
Shimansky Yu. I. В«Structure and physical properties of binary solutions of alcohols В», PhD dissertation, Taras Shevchenko State University of Kyiv, 1955;
Shimansky Yu. I. В«The temperature dependence of the heat of vaporization of pure liquidsВ» Journal of Physical Chemistry (USSR), v. 32(8), p. 1893, 1958;
Shimanskaya E. T., Shimansky Yu. I. В«Critical state of pure compoundsВ», published by Taras Shevchenko State University of Kyiv, 1961.
References
^Shimansky Yu. I. The temperature dependence of the heat of vaporization of pure liquids. Journal of Physical Chemistry (USSR), v. 32(8), p. 1893, 1958;