The Physics
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Density of Petroleum

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Mass, Weight, Density, or Specific Gravity of Bulk Materials. SI Metric, 9 October 1996. "Oil, petroleum 881" 881 kg/m3
Speight, James G. "2.2 Density and Specific Gravity." The Chemistry and Technology of Petroleum. Marcel Dekker. 1999: 306. "The specific gravity of petroleum usually ranges from about 0.8 (45.3 API) for the lighter crude oils to over 1.0 (less than 10 API) for heavy crude oil and bitumen." 800–1000 kg/m3
England, Mackenzie, Mann & Quigley. The movement and entrapment of petroleum fluids in the subsurface [pdf]. Journal of the Geological Society. 144 (1987): 327-47. "Using the extensive oil industry database of fluid properties, predictive correlations of parameters such as GOR, subsurface density etc. can be made. The correlations use typical surface densities of oil and gas at standard temperature and pressure (STP), ρoilSTP = 800 kg m-3 and ρgasSTP = 800 kg m-3" 800 kg/m3
Formulae, tables, converters specific to materials. All Measures 1999-2004. "820 kg/m3" 820 kg/m3
Veith, Alexander. Petroleum: Its History, Origin, Occurrence, Production, Physical and Chemical Constitution, Technology, Examination, and Uses. Brannt, William T. Philadelphia: Henry Carey Baird, 1895: 44. "Thus for the instance the density of a crude oil of 20° R. has been found as 42° B.= 0.8139, which corrected would be (6 x 0.001 = 0.006) 0.8145." 814.5 kg/m3

Do you ever wonder where gasoline comes from? The answer is crude oil, a thick, flammable, mixture of solid, liquid, and gaseous hydrocarbons. Crude oil, or petroleum, consists of three major classes of hydrocarbons — alkanes, cycloalkanes, and aromatics. The approximate range of hydrocarbons in crude oil is C5H12 to C18H38. These hydrocarbons, along with a number of other substances, comprise the chemical makeup of petroleum.

Petroleum is found in porous rock formations in some areas of the Earth's crust. During the past 600 million years, plants and animals have become buried under layers of rock, which are believed to have later become petroleum. The high organic compound content in petroleum is probably due to the microscopic plankton organism remains.

Petroleum is used mostly by volume for the production of fuel, gasoline, and other energy sources. Therefore, an important property of petroleum is density; a ratio of its mass to its volume. In petroleum production, density is used to give an estimation of the gasoline and kerosene present. This, in turn, determines the price of the gasoline.

The density of petroleum is approximately 800 kg/m3. The specific gravity (density compared to water) of petroleum is 0.8.

Artem Gindin -- 2007