A fluid mixture of low-density alkanes that stays mostly gaseous at Normal Surface Conditions (NTP).
The usual composition is methane (C1) with minor additions of higher alkanes, water vapor and other gases.
May include minor organic and inorganic chemical substances.
See Also
Natural Science / Physics / Chemistry / Chemical Substance
Petroleum Industry / Upstream / Subsurface E&P Disciplines / Petroleum Geology / Petroleum fluids