Linked from
The 100 pages that link to Viscosity, each with the reason it gives.
Boundary layerNarrower topic: Viscosity diffuses momentum from the wall into adjacent fluid.
GlycerolNarrower topic: Glycerol’s unusually slow flow is one of its defining physical properties.
Stokes' lawNarrower topic: Stokes' law expresses how viscosity produces drag on a moving sphere.
Food rheologyNarrower topic: It is the most familiar measure of how readily liquid foods move.
GlazeNarrower topic: A glaze needs enough viscosity to cling without becoming a heavy paste.
Sir George StokesNarrower topic: Stokes’s fluid mechanics analyzed how viscosity governs motion.