When petroleum the fractions rise up the tower?

When petroleum fractions rise up a distillation tower, they encounter a temperature gradient, with hotter temperatures at the bottom and cooler temperatures at the top. As the vaporized hydrocarbons ascend, they cool and condense at different heights based on their boiling points. Lighter fractions, such as gasoline, condense higher up in the tower, while heavier fractions, like diesel and lubricating oils, condense lower down. This separation process allows for the efficient collection of various petroleum products.