The thermophysical properties of gaseous fuel, including the calorific value and Wobbe index, are one its main for industrial use. correctness measurements volumetric energy gas combustion is currently ensured by using sets certified reference materials lowest based on pure gases: hydrogen, methane, ethane propane GSO 11662–2020 / 11665–2020 mixtures 11904–2022 11907–2022 with metrological trac...