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[David Sturzenbecher]

Pretty interesting read...

http://m.nautil.us/blog/the-sound-so-loud-that-it-circled-the-earth-four-times



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[Debbie Dunkley]

Pretty interesting read...

http://m.nautil.us/blog/the-sound-so-loud-that-it-circled-the-earth-four-times



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Thank you… fascinating.

[Tom Bourke]

I was going to be a smart ass and point out the Tsar nuclear test. That one  broke windows 560 mi away.  However it was only 1/4 the estimated explosion of the Krakatoa eruption. 

[Art Welter]

Pretty interesting read...

Good information, but the sound didn't circle the earth four times, the air pressure change did.
The sound of the eruption was heard in areas covering a thirteenth of the globe, makes anything done in our business seem like mosquito farts by comparison.

[Ivan Beaver]

Never mind

[Jonathan Johnson]

Good information, but the sound didn't circle the earth four times, the air pressure change did.
The sound of the eruption was heard in areas covering a thirteenth of the globe, makes anything done in our business seem like mosquito farts by comparison.

Ah, but the air pressure change, or shock wave, is by definition, acoustic energy. And so is sound, so that is where the confusion arises.

However, the shock wave may not have been audible (infrasonic), and usually only audible acoustic energy is considered "sound."

(That analysis certainly doesn't minimize the fact of it being the loudest sound.)

[Ivan Beaver]

Ah, but the air pressure change, or shock wave, is by definition, acoustic energy. And so is sound, so that is where the confusion arises.

However, the shock wave may not have been audible (infrasonic), and usually only audible acoustic energy is considered "sound."

(That analysis certainly doesn't minimize the fact of it being the loudest sound.)

Sound is what happens when air gets pushed-so said a wise man.

[Mike Christy]

Sound is what happens when air gets pushed-so said a wise man.

But the article actually says that the air only gets pushed (moved) when the low troth of the wave goes beyond a vacuum. So "Pressure Wave happens when air gets pushed." 

[g'bye, Dick Rees]

The loudest sound in my life is the silence from my wife if and when I f*** up royally...

[Art Welter]

Ah, but the air pressure change, or shock wave, is by definition, acoustic energy. And so is sound, so that is where the confusion arises.

However, the shock wave may not have been audible (infrasonic), and usually only audible acoustic energy is considered "sound."

The initial shock wave was quite audible, rupturing eardrums, measuring the equivalent of 172 dB at 100 miles, etc.

The spike in barometric pressure that persisted for four trips around the globe was not audible, nor sound in the conventional sense- we don't use a barometer to measure SPL, or a sound meter to measure barometric pressure.

[ProSoundWeb Community]