Comments by "Dr Gamma D" (@DrDeuteron) on "Beirut Explosion Seen From Nearby Boat" video.

  1. the shock is > mach 1 for the first 400m.
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  2. @ebony b the pressure's 2nd derivative w.r.t time times the density is minus it's 2nd derivative w.r.t. space times the elastic modulus, thus arbitrary waveforms propagate at a squared speed equal to the ratio of those pre-factors.
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