| Fuel | Reaction | Standard enthalpy change per mole of oxygen |
| Hydrogen | Reaction (1) 2H2 + O2 = 2H2O | −484 kJ/mole O2 |
| Carbon | Reaction (2) C + O2 = CO2 | −393 kJ/mole O2 |
| Methane | Reaction (3) 0.5CH4 + O2 = 0.5CO2 + H2O | −405 kJ/mole O2 |
| Ferrous oxide | Reaction (4) 4FeO + O2 = 2Fe2O3 | −570 kJ/mole O2 |