Premixed flames occur when fuel and oxidizer are mixed before combustion takes place. This mixture allows for a more uniform and stable flame, as the fuel and oxidizer are evenly distributed. Common examples of premixed flames can be found in gas burners and certain types of industrial furnaces. In premixed flames, the combustion process is typically more efficient and produces less soot compared to diffusion flames, where fuel and oxidizer mix during combustion. This efficiency makes premixed flames desirable in applications like gas turbines and internal combustion engines, where controlled combustion is essential for performance and emissions reduction.