Question

1 ) why does brushing balloon make noise ? 2) why there is so much noise produced when we brust a firecracker?​

Answer 1

Answer:

1) 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.

2) Crackling noise in the firecrackers comes from lead oxide, which turns into lead atoms as the firecrackers explode. These lead atoms vaporize and the vapours make the crackling sound.

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