The viscosity ? of a glass varies with temperature according to the relationship where Qvis is the

Question:

The viscosity ? of a glass varies with temperature according to the relationship

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 ? versus l/T should be nearly linear, and with a slope of Qvis/R. Using the data in Figure, (a) make such a plot for the borosilicate glass, and

(b) determine the activation energy between temperatures of 500 and 900°C.