Why is 194 dB the loudest sound possible?

Why is 194 dB the loudest sound possible?

A note on the loudest possible sound in air A sound of 194 dB has a pressure deviation of 101.325 kPa, which is ambient pressure at sea level, at 0 degrees Celsius (32 Fahrenheit). Essentially, at 194 dB, the waves are creating a complete vacuum between themselves. Feb 6, 2020

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