The density of the glass samples are given in Fig. 2. It is seen
that the density of the glass samples increases with higher PbO
and Bi2O3 contents, because of higher molecular weight of PbO
and Bi2O3 in comparison to SiO2. In the case of PbO glass, the density
could be increased by about 60%. The densities of glasses in
ascending order are BaO, PbO and Bi2O3. Moreover, it was found
that the effect of increasing the BaO content to the glass density
is small when compared to Bi2O3 and PbO cases.