Abstract
Apparatus for measuring the rate of shrinking of a bubble of gas in a small cylinder of molten glass is described with the results of experiments with oxygen in No. 9010 glass at temperatures from 1000° to 1300°C. Approximate solutions of the Stefan problem, resulting from the application of Fick's law to these experiments, are given. They predict that in the initial stages, the rate of decrease in diameter of a bubble should be proportional to the square root of the time elapsed from the beginning of the experiment and be independent of the initial diameter of the bubble. The experiments show an acceleration of the initial rate not predicted by the approximate solutions. Increasing the temperature increases the rate of shrinking of the bubbles. In all experiments, when the bubble was followed for a sufficient length of time, an end point was reached at which the shrinking virtually stopped and a residual bubble remained indicating the presence of 1 or 2%, of impurity in the oxygen.
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