Viscosity is a physical quantity that measures the internal friction in a fluid. In other words: It is the resistance of a fluid to flow.
Viscosity corresponds to the concept of thickness in a fluid.
For example honey is more viscous (or thicker) than water.
Viscosity of a liquid depends upon various factors such as the strength of intermolecular forces, molecular shape/size and temperature.
The molecular models of glycerol and 1-propanol are given here.
Do you expect the viscosity of glycerol to be larger or smaller than that of 1-propanol?
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