A combustion process without heat loss or gain is adiabatic. The adiabatic flame temperature of some common fuel gases like hydrogen, methane, propane and octane with oxygen or air as oxidizers are indicated in the table below:
|Fuel||Adiabatic Flame Temperature (K)|
|Oxygen as Oxidizer||Air as Oxidizer|
|Butane - C4H10||3373||2243|
|Hydrogen - H2||3473||2483|
|Methane - CH4||-||2223|
|Propane - C3H8||2799||2268|
Excess air will reduce the adiabatic flame temperature and is often introduced to avoid flame temperatures exceeding limits sets by the materials in the combustion system.