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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If it was frozen it would not combust because gasoline combusts at 1950 degrees celcius. Basically the first law of thermal dynamics explains this. What would happen is it would the cube would melt and evaporate. Much like if you took a lighter to ice.