<Tr> <Th> Common symbols </Th> <Td> η, μ </Td> </Tr> <Tr> <Th> Derivations from other quantities </Th> <Td> μ = G t </Td> </Tr> <P> The viscosity of a fluid is the measure of its resistance to gradual deformation by shear stress or tensile stress . For liquids, it corresponds to the informal concept of "thickness": for example, honey has a higher viscosity than water . </P> <P> Viscosity is the property of a fluid which opposes the relative motion between two surfaces of the fluid that are moving at different velocities . In simple terms, viscosity means friction between the molecules of fluid . When the fluid is forced through a tube, the particles which compose the fluid generally move more quickly near the tube's axis and more slowly near its walls; therefore some stress (such as a pressure difference between the two ends of the tube) is needed to overcome the friction between particle layers to keep the fluid moving . For a given velocity pattern, the stress required is proportional to the fluid's viscosity . </P>

What does it mean to be more viscous
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