Science Experiments / Re: Resonant effects & few questions, if you hv facility pls do these experiments...« on: 01/07/2018 12:17:13 »
Quote from: Lucy
You can break the glass with very tiny powerIt is true that they shattered the glass, and made it useless to hold water.
But it is a considerable step to say that you could "shatter" water molecules into hydrogen and oxygen.
In fact, they didn't shatter very much of the glass. A back-of the envelope calculation:
- The glass looked to be about 4cm diameter and 4cm high
- The area of glass would be about 50 sq cm
- When it shattered, the amount of full-depth break looked to be about 20cm in length
- The Si-O bond length is around 150pm (150x10^-12)
- So the area that was actually shattered was about 3x10^-9 sq cm
- The sound managed to shatter about 1 in 10^10 atomic bonds in the glass
- This is moderately easy in glass, since it suffers brittle fracture
- Liquid water does not suffer brittle fracture
- Solid water (ice) does suffer brittle fracture, but it will break apart at the relatively weak "Hydrogen bonds" (ie between different H2O molecules), not the much stronger Oxygen-Hydrogen covalent bonds within a single H2O molecule.
So acoustic or electromagnetic resonance won't break apart a significant number of water molecules. To break apart water molecules, you need temperatures of several thousand degrees.
It is possible to reach these temperatures by discharging an electric spark in water, or by applying high power ultrasound power. But these are "brute force" approaches, rather than a resonance effect.
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