What are the steps involved in fractional distillation?

• 1

  Crude oil is mostly vaporised
• 2

  vapours rise up the fractionating column and cool down
• 3

  They condense at different points on the column depending on their boiling points.
• 4

  The column is hotter at the bottom and cooler at the top.
• 5

  Highest boiling point fractions condense at the bottom.
• 6

  Lowest boiling point fractions condense at the top.