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Fractional distillation of crude oil
Crude oil heated at bottom, add continuously, hot vapour rises, fractions come off at different levels depending on their boiling point, higher boiling point fractions come off at lower points
Characteristics of small molecules
Low boiling point, light in colour, easy to light, runny
Characteristics of large molecules
High boiling point, dark in colour, hard to light, thick
What is bitumen used for?
Road surfacing