You know when you fill a wine glass with water and rub your finger around the top and it makes a pitch? And if you add more water, the pitch gets lower?  What is vibrating and causing the sound, and is the change in pitch proportional to anything, such as height of water, volume of water, radius at the water level, surface area of the top of the water, surface area of the glass being covered, etc.?
202092
To make a wine glass sing, you will need the following materials: \nwine glass - a crystal, thin-walled one works best \nseparate glass of water \nwet fingertip \n\nTo make the wine glass sing, do the following: \nHold the empty wine glass on a tabletop at the base of the stem with one hand. \nWet the index or middle finger of your other hand with some water. \nLightly rub your wet finger along the rim of the glass. \nAs you rub the glass, you will hear the "singing" sound of the glass. You may have to re-wet your finger periodically and/or adjust the pressure of your finger on the rim of the glass to keep producing the sound. \nYou can change the pitch of the sound by adding water to the glass. \n \n\nEvery material (such as glass, steel, concrete) has a natural frequency at which it vibrates, called a resonant frequency. If you put energy into the substance at its resonant frequency, you will force it to vibrate or resonate (resonance is a forced vibration). In the case of the wine glass, your finger slides and sticks along the surface of the glass as you rub the rim (a wet fingertip has no oil and makes a better contact with the glass). The rubbing imparts energy to the glass molecules and causes them to resonate. The motion of your hand sets up a wave of vibration traveling through the glass. The vibrating glass causes air molecules to vibrate at the same frequency. The vibrating air molecules are the sound wave that you hear (the frequency or pitch of the sound wave is the same as the resonant frequency of the glass). \n\nSo, how does the water change the pitch of the singing wine glass? As the resonant wave moves around the glass, it drags the water molecules with it, creating a wave of water that you can see near the edge of the glass. The dragging water molecules effectively increase the mass (both the water and the glass molecules) and reduce the energy of the wave traveling through the glass. When the energy is reduced, so is the frequency of the wave in the glass, which is reflected in the pitch of the sound wave that you hear.  \n\nIf you impart enough energy to the glass at its resonant frequency, you can cause the glass to shatter. However, this takes more energy than you can provide by rubbing the rim. Some singers can sing a note equal to the resonant frequency of a wine glass and cause it to shatter (see Resonance for a video of this phenomenon). \n\nResonance has also been shown to cause bridges to collapse. Marching troops of soldiers will often break cadence when crossing a bridge to prevent a resonance collapse. The most famous example of resonance was the Tacoma Narrows Bridge in Washington State (also called Galloping Gertie). In 1940, just months after its completion, winds in the Tacoma Narrows matched the bridge's resonant frequency and caused the suspension bridge to sway uncontrollably. Within hours, the bridge collapsed (see The Tacoma Narrows Bridge Disaster for photos and a video of this event).
68064
oldhippypaul is right, the correct statement is "both corks are subject to the same buoyant force". The explanation is that, if they´re identical,they weigh the same. Since there in balance (i.e., there not sinking or emerging) the bouyant force must equal thre weight and, therefore is fhe same.
400008
You need to match the resonant frequency of the glass, but you also need a large enough amplitude (i.e., volume) to get violent enough vibrations.\n\nYou might find out the resonant frequency (pitch) by striking the glass with a pencil or something. Hanging it from a string could help, because it might be dampened by whatever it's sitting on.
16973
The collision between a pendulum and 2 surfaces of the same material with symetrical surroundings will generate a similar sound. (tick tick)  If you make the material that the pendulum hits different (or to a lesser degree the material attached to the material the pendulum strikes) you change the sound.  Thus, tick tock.\n\nSounds are vibrations that hit the ear and are transmitted by electrical impulses to the brain for interpretation.  If you change the vibration's (different material vibrate at different frequencies) frequency(high/low pitch) and/or amplitude (sound level) you change the sound.\n\nA tick I believe is a higher freqency than a tock.\nHit the pendulum against a surface harder and the amplitude of the sound wave will increase, thus sounding louder.
662404
The bubbles are caused by two things:\n1.  Champagne (or, as it is properly referred to as, sparkling wine) is infused with carbon dioxide, at high pressure, which expands upon the opening of the bottle, creating bubbles.\n2.  The bubbles generally form along the sides of the glass where imperfections in the glass (all glass has imperfections, which is why it is glass and not crystal) allow the expanding gas to accumulate.  \n\nThus, bubbles aren't caused by dirt, but do form where imperfections exist.  Pouring salt into a glass of champagne or beer will also have the effect of creating bubbles by giving the gas a place to accumulate.
456657
Most things are good, in moderation. Anything in excess could kill you (even water). There's nothing wrong with having a glass of wine every now and then, as David pointed out. It's making a habit of it, or depending on the wine to ease your spirits, that causes problems. Don't get drunk, and you're okay.
79499
some glass reacts to vibrations in a way to make it shatter. (even vibrations you can't feel or hear) Another reason could be that it was previously exposed to severe temperature changes and was not made of tempered glass. any additional temperature changes might be the straw that broke the camel's back and it just broke when the room temp changed by a few degrees
671090
By rubbing the lip, you're vibrating the glass. When you rub it at the right speed, it stars vibrating at its resonant frequency, and it makes that noise.\n\nThe resonant frequency of an object is kinda like a swing. If you push and pull at the right time (the resonant frequency), you can make the swing go higher and higher. If you push at the wrong times, you're not going to get anywhere.
436501
because the sound reverberates in your skull, and with the water acting as a sound proofing, there is very little distraction noise-wise and the whispering becomes clear.  Basically you are hearing from the inside out.  Now when you come out of the water, there is water in your ears, and you no longer have the insulation of the water around your head.  That, combined with the noise of sitting up, the water splashing around you, the ambient noise from your surroundings, causes you to not recieve the soundwaves, which are now outside of your head and "mixing" with the rest of the noise.\n\nGet it?
237649
may b a wine....but i dint get what "tpt" means??
125209
Since you are referring to the volume of the water container and not the volume of the water itself...then the container should have at least twice the volume of the water, so that if another liquid having the same volume of the water will be added to the water in the same container, no spilling will happen. And there are many other liquids that can be added...\n\nHowever, if you made a mistake and you are referring to the volume of water after all, and the original volume of water will not change even if another liquid with the same volume will be added, then that other liquid can be LPG (liquified petroleum gas?!?). The volume of water will not change since, at ordinary temperature, the LPG when poured(?) to the water container will instantaneously change to gas, and therefore, no liquid will be effectively transferred to the water container. Therefore. no change in volume will take place!
432363
The water evaporates from the head (Maxwell-Boltzmann distribution)\nEvaporation lowers the temperature of the glass head (heat of vaporization) \nThe temperature drop causes some of the dichloromethane vapor in the head to condense \nThe lower temperature and condensation together cause the pressure to drop in the head (ideal gas law) \nThe pressure differential between the head and base causes the liquid to be pushed up from the base. \nAs liquid flows into the head, the bird becomes top heavy and tips over during its oscillations. \nWhen the bird tips over, the bottom end of the neck tube rises above the surface of the liquid. \nA bubble of vapor rises up the tube through this gap, displacing liquid as it goes \nLiquid flows back to the bottom bulb, and vapor pressure equalizes between the top and bottom bulbs \nThe weight of the liquid in the bottom bulb restores the bird to its vertical position
514144
I guess that where you tap the cup is important. The ringing sound will be generated by the energy you put in from the tap. The tone is dependent on the internal volume at the point where you tap, and the thickness of the cup where you are tapping.\n\nIf it were a cylinder I guess that it would produce an even tone all over, maybe you should try that?\n\nFar from being boring this is an interesting question about harmonics, I am off to the kitchen, with a spoon...
133084
I suspect that blub frequency (I'm referring to a poonk sound) is determined more by air cavity size than characteristics of water, and is affected by the container's maximum dimension. This means the final blub probably wouldn't be consistently different in tall and short (but otherwise identical) bottles since the long dimension of the air cavity has shrunk to a minimum.\nThe reason I believe it's not water vibrations is that water in typical sized containers seems to vibrate in a higher frequency range (example, playing a water-filled stemware glass). This may not be completely relevant, but in some air/liquid situations you perceive more of a boink than a blub or a poonk. That's an upward sweep in frequency which I'd bet indicates a shrinking air cavity.\nAs far as measuring the frequency, I'd suggest first identifying a pitch. You probably can train your ear to find a pitch if you can't already. Then find a musical instrument and try to match the pitch. Assume A natural above middle C is 440 Hz (or you won't be far off if you assume middle C is 256 Hz), and go from there. An octave higher is twice the frequency, and a half-tone is a ratio of 2^(1/12) or about 1.06.
322776
Good question.  I have noticed it but have never put a lot of thought into the phenomenon.  Now that you have mentioned it, I too would like to find out why.\n\nIt is not the actual boiling of the water; it occurs just prior to boiling.  I wonder if the molecules at the hottest point (just above the bottom of the pot) have gained enough energy and begin to expand into small bubbles of steam but as they rise, they loose energy to the molecules higher up and in so doing, they implode.  The resulting sound is what is heard.\n\nOr there could be some kind of resonance as many areas suddenly turn to vapour IN THE water.  Just a few thoughts.
641147
Music is organized sound, so I think the answer would be "irregular vibration patterns".  These links should help.
120627
Sound is not a dimension of its own. It is simply the result of waves passing thru the air. This causes the air to be compressed and de-compressed according to the kind of disturbance that caused the wave. When you shout or hit something the air in this region is compressed and then begins to travel outward, fairly equally in all possible directions from the source.\n\nEach occurrence of the sound causes a new wave-front to be formed, Imagine a water wave, but in the air, and instead of seeing and feeling it you hear it...and if it's loud and intense enough you'll feel it.\n\nThe concept of dimensions gets tricky when we 3-d humans get beyond 4 dimensions of our real world; length, width, height, time.\n\nThere are many, many dimensions, but they reside in mathematical space and are impossible to visualize from the most part. One may be able to convince themselves that they can visualize 5 dimensions, but most likely not.\n\nI can't say for sure if anyone has enumerated the dimensions or not, and if they did if it would be a number you could really.....well...count on.....lol. The idea of a dimension has to be an abstract one of course, so you would have to let go of your standard thought about length, width and so on. Not an easy task to 'accept' for some folks, but that's what makes our world so much fun....always something cool to learn, discover or think about.\n\nHope this helps.