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The solid of the glass offers a better conduction route for sound than the air insulated contact your ear would probably give with its best fit.

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Q: When you put a glass on a wall how does it help you hear?
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When you tap a glass with a little water in it It has a high pitch when you tap a glass with water filled to the top it has a low pitch why does this happen?

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Related questions

Best way to hear someones conversation on the other side of the wall?

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