Because crude oil can be fractionally distilled and chemically synthesized into a virtually endless array of distinct chemical intermediates and consumer compounds, there is no single definitive numerical total of petroleum products. However, commercial refineries typically categorize primary output into broad streams such as liquefied petroleum gases, gasoline, kerosene, diesel fuel, heating oils, lubricating greases, paraffin waxes, asphalt, and thousands of specialized petrochemical feedstocks that branch out into countless secondary consumer goods.