Sit comes up inside a production steel pipe, natural gas is usually a mixture of the lightest alkanes, which are hydrocarbons of the C n H 2n+2 series. Methane (CH 4 ) dominates (between 85 and 95 percent), followed by ethane (C 2 H 6 , typically 2 to 7 percent by volume), small amounts of propane (C 3 H 8 ), butane (C4H 10 ), and pentane (C 5 H 12 ), and traces of carbon dioxide, hydrogen sulfide, and other gases. Gas processing removes most of these things before the final product, about 95 percent methane, reaches consumers.

中文翻译：

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数字不会说谎

坐在生产钢管内，天然气通常是最轻的烷烃的混合物，它们是碳氢​​化合物 n H 2n+2系列。甲烷（CH 4 ) 占主导地位（在 85% 到 95% 之间），其次是乙烷 (C 2 H 6 ，通常为体积的 2% 至 7%），少量丙烷（C 3 H 8 ), 丁烷 (C4H 10 ) 和戊烷 (C 5 H 12 )，以及微量的二氧化碳、硫化氢和其他气体。在最终产品（约 95% 的甲烷）到达消费者手中之前，气体处理会去除大部分这些物质。