The question has been discussed very often, whether glasses show a real Newtonian behaviour, in other words if there is a proportionality between a given shear stress τ (g cm−1 sec−2) and the velocity gradient p = dv xt/dy (sec−1) for the corresponding viscous flow of the material. If the glass behaves in such a way, the ratio between the two quantities is called the (coefficient of) viscosity η, which is defined by the equation τ = ηp, η being usually expressed in poises (g cm−1 sec−1). In many materials, however, this equation is not fulfilled.


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Copyright information

© Springer-Verlag Berlin Heidelberg 1975

Authors and Affiliations

  • J. M. Stevels
    • 1
  1. 1.Laboratory of Inorganic ChemistryEindhoven University of TechnologyEindhovenThe Netherlands

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