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The sound of the largest explosion is estimated to have been 180dB at 160km distance, and SPL falls off by 6 dB for each doubling of distance, so at the commonly used 1m distance it would have been over 280 dB.
And 286dB at 0.5m, and 292dB at 0.25m, and infinity dB at 0m
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And what exactly is a sound wave if not a pressure wave?
