Thanks to @freewritehouse, @zapfic.club, and @felt.buzz for bringing another topic for us. Here is my entry for Zapfic240Monday.
Once, we were experimenting in the Physics lab. Our teacher took a bottle and fixed a ring in it. After the ring was switched on, it produced a sound. He created a vacuum in the bottle, now ring vibration was visible but there was no voice.

Image Source(Pixabay,OpenClipart-Vectors)

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