Опубликовано в "Наука, Наука", язык - English. 4 страниц.
Petroleum includes hydrocarbons in all formations i.e. solid, liquid and gaseous. On surface pressure and temperature, methane, ethane, propane and butane remain gasses, while pentane and other heavy hydrocarbons occur as liquids and solids. When retrieved from an oil well, the crude oil will consist of some natural gas as well. Еще
