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 Combustion of Hydrogen Gas.

In the combustion of one pound of hydrogen gas, 5 libs. 10 oz. 5 gros 24 grs. of oxygen gas are absorbed, and 6 libs. 10 oz. 5 gros 24 grs. of water are formed.
 * Caloric from each lib. of hydrogen gas,295.58950.
 * Caloric from each lib. of oxygen gas, 52.16280.
 * Caloric disengaged during the formation of each pound of water,     44.33840.
 * Caloric retained by each lib. of oxygen after combustion with hydrogen 14.50386.
 * Caloric retained by each lib. of water at the temperature of Zero (32°) 12.32823.

Of the Formation of Nitric Acid. When we combine nitrous gas with oxygen gas, so as to form nitric or nitrous acid a degree of heat is produced, which is more less considerable than what is evolved during the other combinations of oxygen ; whence it follows that oxygen, when it becomes fixed in nitric acid, retains a great part of the heat which it is possessed