Hearing 099

[MRC01]

You misinterpreted what it meant. The air pressure drops by 1 part in 30. Sounds pressure is defined from the MEAN air pressure. In terms of SOUND PRESSURE it's (milliHz or Microhz) incredibly high energy. In terms of absolute pressure, it/s still 1/30.
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Ah, so imagine the changing air pressure as an extremely low frequency oscillation or sound wave. It requires tremendous energy to change the air pressure over multiple square miles.