Society of Glass Technology · [Sheffield] · leaf 268
. The following results were found for the densities of the twoseries :— Table III.Series 100SiO2,40Na2O,zBaO. Series 100SiO,,20Na2O,aiBaO. y Mole- Per N /■ Mole- Per Melt cules cent. Melt cules. cent. No. BaO. BaO. Density. No. BaO. BaO. Density. 190,4 5 8-3 2-604 191.4 5 9-5 (2-557) B 10 153… … 10 15 20 25 Molecules BaO. Fio. 1. value for 191.4 is extrapolated. The following points are ofinterest. (1) Where the molecular barium oxide content is less than16 molecules the addition of sodium oxide increases the density. (2) In both series the addition of barium oxide increases thedensity.…
Glass
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