Natural gas produced from either an oil or gas reservoir is a complex mixture with various compounds of hydrocarbons (primarily methane, butane and varying amounts of ethane, propane and even higher molecular weight hydrocarbons), an amount of water vapor, small amounts of non-hydrocarbon gases (carbon dioxide, hydrogen sulfide and mercaptans such as methanethiol and ethanethiol) and even neutral gases such as nitrogen and helium etc. Natural gas provided of about 23% of the total global energy supply, and that share would certainly increase. While oil is a liquid and coal is a solid, natural gas is a gaseous-phase fossil fuel. It is colourless, odourless, shapeless, and lighter than air. When burned, it gives off about 1,000 Btu (British thermal unit) per scf (standard cubic foot) and is used for domestic applications such as cooking, space heating and also to generate electricity.
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