Suppose you take an ice cube tray and use petroleum/gasoline to freeze some blocks of it. What would happen if you:
a) placed a cube above naked flame; or
b) threw a cube against a surface which caused a spark?
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I'll just assume al of the conditions are in place for the gasoline to freeze. With that said I think the cube would just flare up quickly over an open flame. Nothing would happen if I threw it against a surface that could potentially cause a spark.