fracyional distillation

• process in which crude oil is separated into useful parts by heating and separating due to their boiling points
• refinery gas = LPG
• gasoline = cars
• naphta = making chemicals
• kerosene = airplane fuel
• diesel oil = lorry
• fuel oil = ships
• residue = bitumen for roads
• small molecules = low boiling point, very volatile

  large molecules = high boiling point, not very volatile