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Description: This chart can be used to determine more than one characteristic of natural gas under different conditions. The characteristics are gas density (ρg), gas pressure, and hydrogen index (Hgas). For known values of gas density, pressure, and temperature, the value of Hgas can be determined. If only the gas pressure and temperature are known, then the gas density and Hgas can be determined. If the gas density and temperature are known, then the gas pressure and Hgas can be determined.