Why does the shape of a candle flame look pear shaped?Please explain in detail.

A candle flame has a tear drop shape.
When you have combustion, such as a match, what happens is that oxygen gets consumed, and other gases (such as carbon dioxide) get produced. In addition, of course, energy is liberated in the form of heat and light. The produced gases are hotter than the environment due to the generated energy, and they expand, as heated gases do. Then, of course, since their density is lower than the surrounding atmosphere, the gas tends to rise. This has two effects. First, while it moves up, it carries energy with it, thus the flame ends up pointing "up". Second, since the products of combustion move up, they make more oxygen available to make the flame continue to burn.

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