====== Beer Bottle Tones ====== {{:physicsdemos:waves_and_optics:acoustics:beer_bottle_tones.jpg?400|}} Tones are generated by blowing across the mouth of a beer bottle. Water added to the bottle increases the pitch of the tone made. {{ :physicsdemos:waves_and_optics:acoustics:beer_bottle_tones_20200410132253.mp4?800 |}} L3 PIRA DCS 3C20.25