The viscosity η of a glass varies with temperature according to the relationship where Qvis is the
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where Qvis is the energy of activation for viscous flow, A is a temperature-independent constant, and R and T are, respectively, the gas constant and the absolute temperature. A plot of ln η versus l/T should be nearly linear, and with a slope of Qvis/R. Using the data in Figure 13.7, (a) make such a plot for the borosilicate glass, and (b) determine the activation energy between temperatures of 500 and 900°C.
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a Below is shown the logarithm viscosity versus reciprocal of ...View the full answer
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Related Book For 
Materials Science and Engineering An Introduction
ISBN: 978-0470419977
8th edition
Authors: William D. Callister Jr., David G. Rethwisch
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