**2. Temperature dependence of saturated vapor pressure**

The values of the vapor pressure of liquid substances are mostly determined by the static and dynamic (mainly ebulliometric) methods. A comparative ebulliometry is frequently employed due to its simpler technique and suitability for the series of determinations. The greatest number of saturated vapor pressure of organic compounds was obtained by this method in the moderate ("atmospheric") range of pressure 2-3 (, ) *p* <sup>k</sup> <sup>P</sup> <sup>a</sup> 100-150. The highest accurate of vapor pressure is usually attained in this range that makes it possible to obtain reliable derivative values, in particular, the enthalpies of vaporization. Few *pT* data are available in the literature for the entire region of liquid phase because of methodical difficulties and high errors of determination at low (<1 kPa) and high (>200 kPa) pressures.
