Crude oil is refined into a wide variety of products.

A furnace heats the crude mixture; the vapor rises in a distilling tower where various fractions are siphoned.

The heaviest products are recovered above 600°C: asphalt, grease, wax.

Subsequent fractions yield diesel fuel, kerosene, jet fuel, and gasoline.

The lightest fraction (requires lowest temperature to boil) is liquefied petroleum gas.