This interesting phenomenon is the product of boiling melted candle wax over a campfire upon which water is poured. Since the boiling point of wax is significantly higher than that of water (paraffin wax has a BP above 400 C), the poured water instantly boils off, rapidly expanding in the process and carrying with it liquid wax. The liquid wax vaporizes during the expansion, producing the huge flame seen in the video.
It is incredibly unsafe and foolish to even attempt! I see another safety video by Yedidia in the future…
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