Blue flames are a type of flame that appears blue in color, often indicating a more complete combustion of fuel. This phenomenon occurs when gases, such as natural gas or propane, burn at high temperatures. The blue color is a result of the specific wavelengths of light emitted during the combustion process. In contrast to yellow or orange flames, which are caused by incomplete combustion and the presence of soot, blue flames are typically hotter and more efficient. They are commonly seen in gas stoves and Bunsen burners, where they signify that the fuel is burning cleanly and effectively.