SURFACE TENSION AND DENSITY OF LIQUID EARTH ALKALINE METALS MG CA SR BA

The surface tension and the density of the liquid earth alkaline metals Mg, Ca, Sr and Ba were determined in a region of high temperature. The method used is described in Ref. [8]. Fair discrepancies in temperature dependences or absolute values or in both with regard to existing data were found. The measurements correspond to the following formulas: Mg:σ = 721-0·149 T ρ{variant} = Ref.[5] confirmedCa:σ = 472-0·100 T ρ{variant} = 1·613-2·21 10-4 TSr:σ = 392-0·085 T ρ{variant} = 2·648-2·62 10-4 TBa:σ = 351-0·075 T ρ{variant} = 3·59-2·74 10-4T The intersection of all surface tension lines in one point near σ = 0 is interpreted as a consequence of equal surface energy per surface atom for all earth alkalines. © 1968.