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Old February 7, 2019, 12:50 AM   #4
JohnKSa
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Join Date: February 12, 2001
Location: DFW Area
Posts: 22,487
I've seen that in a few gel videos.

When the gelatin collapses, the air inside the cavity is compressed extremely rapidly. When you very rapidly compress air in the presence of anything that is remotely flammable, the heat generated can rise to the point of causing the air/fuel mixture to burn.

Here's a good example of it:

https://www.youtube.com/watch?v=fX4ODh1g4eM
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