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High density hydrocarbon that stay liquid in subsurface reservoir.
The usual composition ranges between C8 and C16 and API gravity is in the range of 10° ÷ 20.7° (Specific Gravity = 0.93 ÷ 1.0).
May It may also include minor organic and inorganic chemical substances (< 7% in weight).
See also
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Natural Science / Physics / Chemistry / Chemical Substance
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