El-s T P VL ΔV σ rm Vm VLf λex λT δ Li 1600 0,91 1,73 13058 273 1,57 0,97 0,75 134720 151512 -12,5 Na 1150 0,96 3,09 8760 120 1,89 1,70 1,39 89590 98320 -9,7 K 1000 0,73 5,82 10516 65 2,36 3,31 2,51 75994 82311 -8,3 Rb 950 0,92 7,25 7893 50,7 2,53 4,08 3,17 69742 73767 -5,8 Cs 800 0,20 8,56 31264 47,5 2,74 5,18 3,37 65126 72209 -10,9 Hg 613 0,75 1,57 6820 384 1,60 1,03 0,54 59275 67675 -14,2

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 % is the calculation error λT.

Table 3: Calculation results for the evaporation heat on the saturation curve for metals by using the metal radii.