Hi!
I've been thinking and I believe Oda made a mistake when Akainu kills Ace. Akainu says something like "Magma can burn even fire", but, in terms of temperature, fire is almost always hotter than lava or magma. So, to me, the way Akainu killed Ace is wrong physically speaking. Of course, nobody gives a damn about my ramblings, but I felt it was necessary tell everyone about this for my mental health. Furthermore, Ace was one of my favorite characters so I feel it is my duty to make clear that Akainu was mistaken and Ace's fire was capable of withstand the Admiral's lava and survive unharmed.
Here I have some comparatives between magma/lava temperatures and those of the fire:
Fire first:
Under normal gravity conditions and with a closed oxygen valve, a Bunsen burner burns with yellow flame (also called a safety flame) at around 1,000 °C. Flame temperatures of common items include a blow torch - which can burn usually up to around 1,600 °C, a candle at 1,400 °C, a propane torch at 1,995 °C, or a much hotter oxyacetylene combustion at 3,000 °C. Cyanogen produces an even hotter flame with a temperature of over 4,525 °C (8,177 °F) when it burns in oxygen.
Magma and lava on the other hand:
It should be noted that magma and lava are two different things, magma is molten rock that lies beneath the surface of the earth; once exposed, magma becomes lava.
Felsic lava can erupt at temperatures as low as 650 to 750 °C. Intermediate or andesitic lavas are lower in aluminium and silica than felsic lavas, and also commonly hotter (in the range of 750 to 950 °C). Mafic or basaltic lavas are typified by their high ferromagnesian content, and generally erupt at temperatures in excess of 950 °C. Ultramafic lavas are thought to have erupted at temperatures of 1600 °C.
Magma is a complex high-temperature fluid substance. Temperatures of most magmas are in the range 700 °C to 1300 °C, but very rare carbonatite melts may be as cool as 600 °C, and komatiite melts may have been as hot as 1600 °C.
So, the outcome of said battle, (I'm a physicist, so speaking as a One Piece-lover-physicist) would have been, in the worst scenario a tie. But Ace would have the upper hand in other possible scenarios.
Thanks for reading my idiot ramblings this far, I know they're futil but still I had to tell everyone that magma or lava can't burn even fire, Akainu's power is colder than Ace's…
Nevertheless, Ace died, Oda wrote it, and that's that.
P.S. Sorry if my post isn't that clear, I'm still working on my english skills.
P.S.2. Again, sorry if someone else has already said something like this before.