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The thermal expansions of a number of binary lithium, sodium, and potassium silicate glasses are reported over the temperature range from room temperature to their deformation points. The expansivities of the glasses increased with increasing alkali oxide concentration. These expansivities were used to calculate density values, which were correlated with density measurements in the liquid range. At room temperature the density of each series increased with increasing alkali oxide concentration.doi:10.6028/jres.057.012 fatcat:5uhnvzzzsbg6vdszooodlfoq4q