The viscosity of borosilicate glass melt (in Poise) follows the VFT equation in the form log(η)=A+B/(T-T0), with A=-1.0836, B=5433, and To=179 oC. The parameters hold for melt temperatures between 531 oC and 1400 oC. Estimate the activation energy for viscous flow at 1000 oC.
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