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The calorific value of acetylene (C2H2) is approximately 31.1 megajoules per cubic meter (MJ/m³) when measured at standard temperature and pressure. In terms of its energy content, acetylene has a higher heating value (HHV) of about 47.5 MJ/kg. This high energy content makes acetylene a valuable fuel for various applications, including welding and cutting metals.

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The substance with the highest calorific value is generally considered to be hydrogen, which has a calorific value of about 141.9 megajoules per kilogram (MJ/kg) when combusted. In practical terms, when comparing traditional fuels, acetylene has one of the highest calorific values at around 50 MJ/kg. However, for conventional fuels, gasoline and kerosene also have high calorific values, ranging from 44 to 47 MJ/kg.


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