A blue flame results from mixing primary air with gas prior to ignition. What is this type of flame referred to as?

A blue flame that results from the proper mixing of primary air with gas prior to ignition is referred to as a Bunsen flame. This type of flame is commonly associated with Bunsen burners, which are laboratory devices used to produce a controllable flame. The characteristic blue color indicates a complete combustion process, where adequate oxygen is available for the gas, leading to a more efficient and hotter flame.

This blue hue arises because the fuel is burning completely, resulting in the production of water vapor and carbon dioxide rather than soot or unburned fuel, which would produce other flame colors. The Bunsen flame is typically used in controlled environments because it provides a high-temperature, stable flame suitable for various applications.

In contrast, descriptions like a luminous flame or a gas-rich flame would suggest incomplete combustion, often characterized by yellow or orange hues due to soot production. An air-rich flame implies that there is an excess of air, but the specific term "Bunsen flame" accurately identifies the flame associated with complete combustion and optimal gas-air mixing.