Unfortunately, no. There would be no popping sound in this space-balloon experiment, as sound waves require a medium to move through. ... In space, the air molecules would still expand outward, but without any air in a vacuum, there is no “sound barrier” to break, per se, so it would be a completely silent pop.

What happens to balloons in the sky?

One is that atmospheric pressure is dramatically reduced at high altitudes, so a helium balloon expands as it rises and eventually explodes. If you inflate a balloon beyond its limits at room temperature, it will break into small pieces up to about ten centimetres long.

Is letting go of balloons illegal?

(a) No person or group shall release, outdoors, balloons made of electrically conductive material and filled with a gas lighter than air, as part of a public or civic event, promotional activity, or product advertisement.