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GCSE Chemistry · key term
A measure of a fluid’s resistance to flow. A more viscous liquid flows less easily.
Used by AQA and Edexcel
Specification 4.7.1.3 · Paper 2
A measure of how much a fluid resists flowing; a more viscous liquid flows less easily.
Revise: Hydrocarbon Properties and CombustionViscosity describes resistance to flow: a more viscous liquid is thicker and flows less readily. The stronger attractions between larger molecules also help explain why larger liquid hydrocarbons are generally more viscous.
Specification 8.5 · Paper 2
Revise: Properties of FractionsThis difference in molecular size produces linked trends in boiling point, ease of ignition and viscosity.
A liquid’s resistance to flowing; a more viscous liquid flows less easily.
For increasing molecular size, recall: boiling point rises, viscosity rises and flammability falls.
A high-viscosity liquid flows less easily; avoid describing high viscosity as ‘runny’.
Link later, higher-boiling fractions with greater viscosity and greater difficulty of ignition.
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