What is a flame? Briefly describe the structure of flame clearly indicating the significance of each region. 

A flame is a visible manifestation of a combustion reaction, which is the process of a substance reacting with oxygen to release energy in the form of heat and light. Flames can be observed in various natural phenomena such as wildfires, lightning, and volcanoes, as well as in human-made objects such as candles, stoves, and engines.

The structure of a flame can be divided into three main regions: the preheat zone, the reaction zone, and the post-flame zone. Each region has its own characteristics and plays a crucial role in the combustion process.

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