Petroleum is an intricate mixture of various phases and components. It is a nonrenewable source of energy. The organic compounds refined out of crude oil are used to produce petroleum based products which are beneficial for varied industries, be it medicines, food, or clothing. Several significant topics like chemical composition, stability, etc. are covered in this book. It includes certain measures to regulate the stability of crude oil during aging and transportation. This book targets researchers, chemical engineers and people working in the field of petroleum, since several new technologies for petroleum characterization are described in it.