The strength of intermolecular forces and, more specifically, the shapes of a liquid's molecules, determine its viscosity. Typically, polar or hydrogen bonding-capable liquids are more viscous than comparable nonpolar liquids.
Viscosity, the characteristic that characterizes the tendency to flow, is directly tied to the capacity of nearby molecules to rearrange and jostle past one another in liquids. Hydrogen bonds (H-bonds) confound the picture of viscosity at the molecular level. As intermolecular forces increase, viscosity also increases. The molecules of liquids are firmly bound to one another when there is a significant intermolecular force. This creates a desire to resist moving. More viscous liquids are those with polar molecules or those that can establish hydrogen bonds. In general, the viscosity reduces as temperature rises.
In general, viscosity rises as temperature falls. The ease with which molecules can move in relation to one another is related to a liquid's viscosity.
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