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Natural gas comes out of the ground. As a product of nature, natural gas is not the same from country to country. Methane is the main component, but metane's percentage can vary between 80% and 95%. Others hydrocarbons' percentage (for example ethane, propane, butane etc) also vary. Since heating value depends on the percentage of the hydrocarbons, heating value also varies.

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Q: Is the heating value of natural gas different in different countries?
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