1. The crude oil is heated using a Bunsen Burner
2. Different fractions have different boiling point so the fraction with the lowest boiling point starts to boil
3. It quickly turns into a gas and rises up the collum passing into the condenser
The condenser is cold as it is inside a jacket containing running cold water
4. The fraction cools and condenses into a liquid and drips into the conical flask which is then removed
Its not untill the whole fraction is removed that the next fraction will start to boil.
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