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RE: " RAREFACTIONS "

Yes, complete silence is a reference level. Just try to ACHIEVE that in practice, however.
It takes special rooms and design to get the SPL down to such levels. ZERO SPL would be roughly the same as absolute Zero. You know it's 'there' but can you get to it?

ALL sound is composed of pressure / rarefaction. If you want just pressure, go under water a few feet. LESS pressure? Go UP in a plane with the door open. Or up a tall montain. The guys that climb the tallest peaks bring OXYGEN cylinders.

I just wonder about how MUCH the difference is in the micro-pressure DURING a sound wave?
Too much is never enough

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