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Pressure isn't measured in joules, the energy in the sun's core is 250 billion atmospheres. This is 25 billion MPa or 25 quadrillion newtons per square metre. A 100 kiloton nuke would have a radius of around 1300 metres with ablast pressure of 20 psi. 20 psi is about 138,000 newtons per square metre. This is about 182 billion times lower than the sun's core. Now correct me if I'm wrong, but by taking the square root of this difference, we can calculate the distance at which this pressure would increase to match the sun's core, if at all.
1.3 km / (Square route of 182,000,000,000) = about 3mm. So this is the distance from the reaction itself at which the pressure would be comparable to the sun's core... I think.
Also pressure by its very nature is a matter of force divided by area, so there's no way any calculation could give a concrete number for taking the sun's pressure without getting an area for whatever was doing the tanking.
1.3 km / (Square route of 182,000,000,000) = about 3mm. So this is the distance from the reaction itself at which the pressure would be comparable to the sun's core... I think.
Also pressure by its very nature is a matter of force divided by area, so there's no way any calculation could give a concrete number for taking the sun's pressure without getting an area for whatever was doing the tanking.