Now at this point the fracture in the lattice continues because the material's covalent bond around the molecules is not able to withstand the material's sideways tear force. Now after a certain time the material will not last, and there will be a fracture, caused by the brake in the covalent bond of some molecules in the lattice.Īs this covalent bond brakes, air molecules start escaping between the lattice molecules of the balloon. The pressure from inside is the vibrational energies of the air molecules as the gas tries to fill all available space volume. Now these covalent bonds are constantly pushed against by the pressure of air inside. These valance electrons now exist as per QM around the whole molecule or group of molecules. The covalent bond that bonds the molecules together is created by electrons that are not shared by multiple atoms and multiple molecules. It is the balloon material, that as it fractures, creates a phenomenon on its surface.Īs per QM, the lattice molecules in the balloon material are held together by the EM force. It is actually a wave that makes the popping sound. You are asking whether this popping sound is made by the difference in air pressure between the inside and outside of the balloon. It's misleading to talk about a "void": there are local pressure areas, where the pressure is smaller than the steady state air pressure, but the pressure is still much, much closer to the normal pressure than it would be in a vacuum.
That pressure variation is typically very small compared to the steady state atmospheric pressure, which is about $100\,000\ \text)$. In other words: air molecules are wiggling back and forth bumping into each other and locally increasing or decreasing the pressure as the get close or far apart. That means that you have local variations of pressure and particle velocity over time and distance in the fluid.
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