What is oil made of?
Oil is a dark red-brown, sometimes almost black, oily liquid. It contains about 1000 substances! The largest part of them (80-90%) are hydrocarbons, that is, organic substances consisting of carbon and hydrogen atoms. Oil contains about 500 hydrocarbon compounds - paraffinic (alkanes), which make up half of all petroleum hydrocarbons, naphthenic (cyclanes) and aromatic (benzene...