IT IS A MIXTURE =]
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No, it is a mixture consisting mainly of hydrocarbons.
It's a mixture of hydrogen, carbon and other 'trace' elements. Natural gas is a naturally occurring hydrocarbon gas mixture consisting primarily of methane, but commonly including varying amounts of other higher alkanes, and sometimes a small percentage of carbon dioxide, nitrogen, hydrogen sulfide, or helium. All is removed from the methane before it is used. We have from 250-100 years of natural gas left depending of the amount of usage.
You can never say that any particular element or compound IS a gas. Every substancecan be solid, liquid, or gas, depending on the temperature and pressure.The following substances, along with many others, are gas at room temperatureand pressure ... conditions in which human people are comfortable:OxygenArgonNitrogenAcetyleneHydrogenHeliumCarbon-dioxideHydrogen-sulfideCarbon-monoxidePropaneButane
natural gas line
The Lower Explosive Limit (LEL) of natural gas (which is primarily methane). is 5% by volume in air. The Upper Explosive Limit (UEL) is 15% by volume in air