superior calorific value

the quantity of energy, expressed in megajoules [MJ], rounded to three decimal places, that is released upon the total combustion of 1 m3(n) of gas in air, when the components present after combustion are brought back to the starting conditions of temperature and pressure, being 298,15 K and an absolute pressure of 101,325 kPa (1,01325 bar), and where the water vapour formed upon combustion is evaporated. Symbol “HS”; unit [MJ/m3(n)]