Sound So Loud It Circled the Earth Four Times | Nautilus

In general, sounds are caused not by the end of the world but by fluctuations in air pressure. A barometer at the Batavia gasworks 100 miles away from Krakatoa registered the ensuing spike in pressure at over 2.5 inches of mercury. That converts to over 172 decibels of sound pressure, an unimaginably loud noise. To put that in context, if you were operating a jackhammer you’d be subject to about 100 decibels. The human threshold for pain is near 130 decibels, and if you had the misfortune of standing next to a jet engine, you’d experience a 150 decibel sound. A 10 decibel increase is perceived by people as sounding roughly twice as loud. The Krakatoa explosion registered 172 decibels at 100 miles from the source. This is so astonishingly loud, that it’s inching up against the limits of what we mean by “sound.”

via The Sound So Loud That It Circled the Earth Four Times – Nautilus

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