High Quality Content by WIKIPEDIA articles! The higher heating value of a fuel is defined as the amount of heat released by a specified quantity once it is combusted and the products have returned to a temperature of 25 °C. The higher heating value takes into account the latent heat of vaporization of water in the combustion products, and is useful in calculating heating values for fuels where condensation of the reaction products is practical. In other words, HHV assumes all the water component is in liquid state at the end of combustion. The higher heating value is experimentally determined in a bomb calorimeter by concealing a stoichiometric mixture of fuel and oxidizer in a steel container at 25° is initiated by an ignition device and the combustion reactions completed. When hydrogen and oxygen react during combustion, water vapor emerges. Subsequently, the vessel and its content are cooled down to the original 25 °C and the higher heating value is determined as the heat released between identical initial and final temperatures.

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