they would just burn in those cases. they pop from the buildup of steam inside the kernel, so if you heat them with too hot of a heat source the hull will burn and let the steam out before they have a chance to pop. thats why you need oil when popping corn in most circumstances, to modulate the heat and avoid burning them. air poppers are kind of unique in not needing oil, but they do still tend to burn the kernels slightly and often have more duds than more traditional methods done properly.
Someone has to have tried throwing a handful of kernels into magma before, right? Or at the very least been very irresponsible with a blast furnace?
they would just burn in those cases. they pop from the buildup of steam inside the kernel, so if you heat them with too hot of a heat source the hull will burn and let the steam out before they have a chance to pop. thats why you need oil when popping corn in most circumstances, to modulate the heat and avoid burning them. air poppers are kind of unique in not needing oil, but they do still tend to burn the kernels slightly and often have more duds than more traditional methods done properly.
Yeah, I looked it up after my comment and was incredibly disappointed.