There is a magic ring which was given to Sifar (a prince). Later there was an battle on his castle and when he was running for shelter he got killed in a magic explosion which landed 12 feet away (on the side which the ring was not on). The explosion is about the same as powerful as twenty pounds of gunpowder in a metal flask. What are the chances that the ring survived.
closed as off-topic by Mołot, dot_Sp0T, L.Dutch - Reinstate Monica♦, Josh King, Frostfyre Jun 17 '17 at 16:52
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Explosions are funny things. I think even a common ring should easily survive the Explosion. Stuff that comes after, maybe not so much
Lets start by ignoring the magic aspect of the ring, because that makes it too easy
As an EMT (a long time ago) we learned some about things that go boom and what to look for as a mechanism of injury. Explosions do damage with 3 mechanisms. The first is the pressure wave. Second is heat, if the explosive material throws a lot of heat. Third is Flying Debris.
Take them in order. Pressure, the equations are complicated but the short form is that the further away you are, the less pressure, and it's a logarithmic equation, so the drop off is really sharp over distance. from 20 feet away, there might be enough of a pressure wave to dent or maybe scar the surface of the ring, but not enough to destroy it. That is given that your comparison is a 20lb black powder bomb.
Heat is more problematic for a ring. If the bomb sets some surrounding wood structure on fire, and it's the right kind of wood and there was enough of it, the resulting fire might get hot enough in a small area to melt the gold of the ring. Conditions would have to be just right, though. If the prince's hand flies out the window the ring survives, if it bounces off the wall and lands in the middle of the fire, well, there goes the ring. The results depend entirely on narrative convenience.
Finally the debris. Again we have to rely on narrative convenience. if the explosion knocks loose a multi-ton block on top of the prince, the ring could very well get squished. Maybe a decorative war axe is flung off the wall and splits the ring in two. Unlikely, but possible.
There are tons of stories about how everything in a blast radius gets mangled except for that one tiny flower, or how a guy survived because he was shielded from the blast by an umbrella. These stories are mostly apocryphal, but they are usually believable.
Explosions are funny things