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GCSE Combined Science · key term
A measure of a liquid’s resistance to flow. A highly viscous liquid flows less easily.
Used by AQA and Edexcel
Specification 5.7.1.3 · Paper 4
Revise: Hydrocarbon PropertiesMolecular size affects three important properties: boiling point, viscosity and flammability. These help determine whether a hydrocarbon is suitable for a particular use as a fuel.
Specification Fuels · Paper 3, Paper 4
A measure of a fluid’s resistance to flow. A highly viscous liquid flows less easily.
State the direction of each trend explicitly: as molecular size increases, boiling point and viscosity increase, but flammability decreases.
High viscosity means greater resistance to flow, not easier flow.
For property comparisons, state the direction of the change: longer chains have higher boiling points, greater viscosity and are harder to ignite.
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Viscosity means resistance to flow. A runny liquid has low viscosity; a thick liquid that flows slowly has high viscosity.