The air in a balloon is at a higher pressure than its surroundings because the elastic tension of the balloon skin is pulling inwards. ... The high-pressure air that was inside the balloon is now free to expand and this creates a pressure wave that our ears hear as a bang.
I am assuming that to much pressure is being applied to the balloon so it blows up. also because the air inside the balloon is trying to escape or expand causing the balloon to burst
A fusion reaction takes place between carbon and another element. Neutrons are released, and a different element is formed. The different element is Lighter than helium.