The visible manifestation of partial combustion is called smoke. It comprises of solid, liquid, and gaseous materials that are unburned. The type of matter burning can be determined by observing the color of the flame and resultant smoke. The temperature of the flame can also be approximated from the color of the flame. This is only feasible in the early stages of combustion however in advanced stages is not. In most cases, fire always moves in direction of low resistance. In cases where many petroleum materials are involved the laws of physics are not obeyed and fire spreads in all directions.

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Color of flame and resultant smoke
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