It has a dry gas, wet gas, volatile oil and black oil phases.

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On the supply side, natural gas rigs are rapidly moving from dry gas production in the Marcellus shales and other basins to wet gas and oil-rich shales.

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For example, if one adds up the wet-gas production from all the shale-gas plays, the answer would be far in excess of the total dry-gas production nationwide.

FORBES: How Much Gas Is There In The Marcellus Shale?

Along the way he set up a company to store, bottle and sell LPG to distributors that led to his next big move: In 2005 he built a plant to produce LPG from "wet" natural gas.

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Along the way Iqbal Ahmed set up a company to store, bottle and sell LPG to distributors, which led to his next big move: In 2005 he built a plant to produce LPG from "wet" natural gas.

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Chris Wick, from the Environment Agency, said landfill sites generated gas when waste broke down but 2012 had been exceptionally wet and it was believed heavy rain had increased the gas produced.

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In January of 1973, US production of natural gas was 1, 948 (wet) billion cubic feet (bcf).

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Or an industry critic might see a dry-gas report, compare it with another estimate made on a wet basis, and conclude that production is falling short of expectations.

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Most raw production estimates, especially by field, tend to be wet, a number that is larger than the dry volume that would relate to national demand for natural gas, or to the longevity of the resource base (which is also usually a dry-gas estimate).

FORBES: How Much Gas Is There In The Marcellus Shale?