Why do wine glasses emit static noise?
Yesterday, while I was holding by ear close to a wine glass (specifically the interior of the glass), I noticed that they produced sound. The noise sounded like static, was only apparent when I practically put my ear inside of the glass, and appeared to increase in volume when my TV was on.
What causes this mysterious sound? Was it Helmholtz resonance?
This question is in the General Section. Responses must be helpful and on-topic.