Two related questions.
Why do balloons make so much noise when they pop?
How much noise would be made if an average-size human being suddenly dissappeared, leaving a vaccuum behind? What if one in ten of the humans on the planet suddenly dissappeared? What kind of noise would this make? Would the sudden drop in pressure cause any kind of damage, like to ears or anything?
If you can’t guess why I’m asking the second question, I’ll tell you in a little bit…
-Kris
The pop is not from the release of air. It is because the balloon has been stretched, and now can contract rapidly. The rapid movement displaces air quickly so you get a quick pulse of air.
A person has a high surface to volume ratio. If a person diappeared, you would only have a 15 psi differential. You have a lot of surface for the air to move across, so it won’t move fast.
If you are standing nearby, all you hear the air air around you which moves to where the other person was filling in where that air left to fill in where the body was. No pop, no bang, just wind blowing softly.
The body dosesn’t have much depth to it, most of it less than 6" from the surface to the core. It’s unlikely that air traveling that distance will build up enough momentum to be compressed when it hits the air coming from the other side. That’s the only other source of noise.
If their clothes don’t disappear with them, it will slow down the movement of air and make it even quieter.
Has someone been reading the Left Behind series again?