Comment: Too many unknowns.

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Too many unknowns.

Mass of the lid?
Surface area of the lid?
Pressure of the closed lit on the pot? (Screws I assume.)
Explosives (assuming they're uniform) follow the inverse square law.
This means that the pressure of the explosives drops by a factor of 1/blast radius^2. I think it would be equally benefitial to look for known objects withing the blast area to see how far they were moved, or how much they were destroyed.