a simulation of viscosity. fluid on left has lower viscosity 1 on right
viscosity measures resistance of liquid being deformed either shear stress or extensional stress. in other words, viscosity resistance of liquid flow.
when liquid supercooled towards glass transition, viscosity increases dramatically. liquid becomes viscoelastic medium shows both elasticity of solid , fluidity of liquid, depending on time scale of observation or on frequency of perturbation.
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