What happens when a balloon flies into the sky?

1. explosion: as the balloon rises, the pressure in the atmosphere gradually decreases, and the ratio between the balloon and the gas filled in it and the atmospheric pressure is too large. The tension of balloon latex can't resist the pressure of internal gas, which will lead to explosion.

2. Hovering: The specific gravity of the balloon and the gas filled in it is only slightly lighter than that of air. When the balloon rises to a certain height, the specific gravity inside and outside the balloon will be the same as the air density decreases. At this time, the balloon will be suspended in the air without obvious expansion and will not explode immediately.