-----------------------+-------------+-----------+-------------------+ | | Heat evolved in | | Symbol and Atomic |the Combustion of | | Weight. | 1 lb. of Fuel. | +------------+------------+--------+----------+ | | | |In Pounds | | | | In | of Water | | | |British |Evaporated| | Before | After |Thermal | from and | | Combustion | Combustion | Units. | at 212 deg.. | +------------+------------+--------+----------+ Hydrogen burned | H 1 | H2O 18 | 62,032 | 64.21 | in oxygen. | | | | | -----------------------+------------+------------+--------+----------+ Carbon burned to | C 12 | CO 28 | 4,451 | 4.61 | carbonic oxide. | | | | | -----------------------+------------+------------+--------+----------+ Carbon burned to | C 12 | CO2 44 | 14,544 | 15.06 | carbonic acid. | | | | | -----------------------+------------+------------+--------+----------+ Carbonic oxide burned | CO 28 | CO2 44 | 4,326 | 4.48 | to carbonic acid. | | | | | -----------------------+------------+------------+--------+----------+ Olefiant gas (ethylene)| C2H4 28 | 2CO2 124 | 21,343 | 22.09 | burnt in oxygen. | | 2H2O | | | -----------------------+------------+------------+--------+----------+ Marsh gas (methane) | CH4 16 | 2CO2 80 | 23,513 | 24.34 | burnt in oxygen. | | 2H2O | | | -----------------------+------------+------------+--------+----------+ Composition of air-- by volume 0.788 N + 0.197 O + 0.001 CO2 + 0.014 H2O ---------------------------------------------------- by weight 0.771 N + 0.218 O + 0.009 CO2 + 0.017 H2O