It's possible that I might have a good chance of understanding it,
and possibly even explaining it, if I could <em><u>SEE</u></em> it !
Answer:
It is cause by radiation that's the answer
Explanation: the heat project sun rays towards the popcorn which causes it to pop
Please find attached photograph for your answer. Hope it helps. Please do comment.
<span>On the y-axis (the bottom of the table) hope this helps</span>