El-s T P VL ΔV σ ri Vi VLf λex λT δ Li 1600 0,91 1,73 13058 273 0,78 0,12 1,61 134720 133995 0,5 Na 1150 0,96 3,09 8760 120 0,99 0,24 2,84 89590 86899 3,0 K 1000 0,73 5,82 10516 65 1,33 0,59 5,23 75994 72581 4,5 Rb 950 0,92 7,25 7893 50,7 1,49 0,83 6,42 69742 65089 6,7 Cs 800 0,20 8,56 31264 47,5 1,69 1,22 7,34 65126 63799 2,0 Hg 613 0,75 1,57 6820 384 1,12 0,35 1,22 59275 56159 5,3

T[K] is the evaporation temperature, P*10-5 [Pa] is the pressure, VL*105 [m3/mole] is the molar volume of liquid, δV*105 [m3/mole] is the volume jump in evaporation, σ*103 [J/m2] is the surface tension coefficient, rm*1010 [m] is the ion radius in Table 2 and the metal radius in Table 3, Vm*105 [m3/mole] is the volume occupied by ions, VLf*105 [m3/mole] is the "free volume" of liquid, λex [J/mole] is experimental evaporation heat, λT [J/mole] is calculated value of evaporation heat, and δ % is the calculation error λT.

Table 2: Calculation results for the evaporation heat on the saturation curve for metals by using the ion radii.