Question: when a wine glass is half full of water, how come you get sound from it?

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  1. Do you mean the trick where the glass rim is rubbed with a wet finger? This is caused by resonance but I don’t know more than that. Sorry 🙂


  2. Hi Shaunt,

    As James said, it is resonance. When you rub your finger around the rim, the friction causes vibration. This vibration occurs at a certain speed, or frequency and we hear it as a certain note. If you change the level of water in the glass, it will change the frequency and sound different.


  3. Nicely explained, Dustin.