The Maximum Bubble Pressure (Jaeger) Method for the Measurement of the Surface Tension of Molten Glass

JSGT_1937_V21_T044_T052

A method is described for determining the surface tensions of molten glasses by measuring the maximum pressure within a bubble formed at the end of a platinum-rhodium tube which just touches the surface of the glass. The results obtained indicate an almost linear decrease of density and surface tension with increasing temperature from 1050° to 1350°. The limiting surface tension -values at t-hose temperatures are approximately 260 and 244 dynes per cm, respectively, for the glass composition investigated.

C. W. Parmelee & K. C. Lyon