what is the scientific reason  your voice get higher when you breath in helium?
411710
Due to the density of Helium compared to pure air. Since our vocal chords are used to a certain amount of force the resonate at a 300m/s (speed of sound in on Earth) but since the helium replaces the denser air it makes our vocal chords resonate at a higher rate about 900m/s 2.5 times the speed of or normal voice. Hence making us sound like those darned chipmunks!
804421
The higher the balloon goes in the atmosphere the less pressure on the balloon. This causes the helium to expand its volume. If the balloon was filled to capacity it would *pop* at higher altitudes.
16121
I once listened to a talk by a vocal coach (Peter Trump - who had performed baritone at La Scala and the Met) who claimed that the secret to a powerful singing or speaking voice had a lot to do with balance.  I remember old records of "Sing Along With Mitch" (Mitch Miller) where the men stood in a semi-circle looking almost ape-like balanced nearly on the tips of the toes that suggested the Trump method.  of course, once learned the principle may be performed more gracefully as in opera, where acting is also required.\n\nBasically, when your body is well balanced while standing on your feet, all your muscles can relax to the greatest extent possible, because they are not needed to maintain balance.  This will include muscles in or near the throat that can constrict free passage of air.\n\nMr. Trump expained that singers who break wine glasses with the power of their voices do not need to use great force.  They select the pitch at which the glass will resonate the add energy to the glass by singing that exact pitch (like pushing a swing higher and higher until it goes over the bar!).  But he indicated that you could place a lit candle between the singer's lips and the glass and it would not flicker.  By properly balancing and relaxing the throat muscles, a column of resonating air is produced that reaches from the glass back to the lips through the oral cavity and down the windpipe past the vocal cords.  Strained muscles would pinch off the air column and cause vibrations to weaken and vary.\n\nInterestingly, he also coached brass players who could produce better tones if their instruments participated in a resonating air column that reached both sides of the mouthpiece, just like a good singer.  Of course the brass players had to learn how to balance sitting down, using good posture at all times.  Hope that helps.  Good luck.\n\nBTW, good speakers (and singers) think "speak through the mask" where they try to project their voice as though their face were a mask, allowing their voice to resonate behind it including perhaps just enough nasal resonance to make the voice pleasant and not distorted, strained or harsh.  The voice is also controlled for speaking and singing by raising and lowering the diaphragm rather than expanding or contracting the rib cage; which would produce muscular strain.
762603
When the person speaks, the helium in his lungs go into his mouth and out of his mouth and into the immediate space in front of it.\n\nWhen you hear his voice, it will have gone through a substantial amount of helium before going through air :)
937535
The helium is compressed when it is in the tank.  When it exits the tank, it expands in the balloons until it equalizes with atmospheric pressure.  Any gas can be compressed, as to occupy a smaller volume.  You can see this if you would take a plastic container fill it with air, and submerge it to the bottom of a swimming pool.  you would able to see that the container would deform because of the volume change of the container.
147009
Helium alters your vocal cords (temporarily, as I'm sure you discovered), causing the pitch of your voice to arrive.\n\nWhile it can be a lot of fun, repeated exposure to your larnyx isn't good for it.
803064
That is the sole reason safety. Hydrogen will explode and helium is a noble gas and is very stable.
527044
How to breathe during a speech depends on the speaker.  Some may need to deep breathe while others don't.\nFor instance, if you feel tingling in your hands or face, do not deep breathe. Your body is sending you signals that you are already taking in too much oxygen.  \n\nIf that isn’t the case, however, deep breathing can be a helpful way to relax your body. But you need to learn how to do it properly. First, place your hand below your breastbone but above your waist. This is roughly where your diaphragm is located. You want to concentrate on expanding your diaphragm when you breathe.\nTake a breath. Do your shoulders move up and down? This means you’re not using your diaphragm enough when you breathe. Now try again. \n\nClose your eyes and consciously try to push your hand out as you breathe. Breathing should be in and out, not up and down. Then feel your hand come back toward your body as you exhale. (Don’t worry if this is frustrating at first; some people are tempted to breathe “backward.” Keep practicing until it feels natural.) \nIf you’re not experiencing tingling sensations, you may want to try several deep breaths before you begin speaking. \n\nThe web site attached gives you more information.
24312
Depends on temp and pressure, but at room temp, avg. pressure, helium's a gas
1023290
When we talk air passes out from our lungs through our vocal chords and is caused to vibrate and you hear the words. When you mix helium with air the resulting mix is less dense so as you breathe out the timbre of your voice is altered. The spped of sound in a less dense helium/air mix is higher than in just air. You are increasing the speed of sound of your voice when breathing out this less dense mixture and this increase in speed will affect the frequencies that make up your 'voice'.\nIf the frequencies are affected the timbre is affected too. A more dense gas may have a very wierd affect.\nStrictly speaking although most people say it is the pitch that changes, it is the actually the 'timbre' which is changed, as your vocal chords produce the same shapes and therefore the same pitch
221941
your breath is warm compared to cold temperatures
786466
Yes.\n\nThere are two states for liquid helium. In the second state it has such a low surface tension that it does flow uphill.\n\nIf you put water in a glass and look at the very edge of the surface you will see it curve from flat, upward to the glass. The water molecules are being attracted to the glass, but are pulled back by attraction to other water molecules and gravity. With helium, this happens but the attraction to spead out is greater....
504140
Very scientific.  I am a MAD SCIENTIST!  Keep your mouth shut when you are breathing....use yer nostrilz.  If you get too much air in your lungz, your body wants to force it eventually.  Practice deep breathing through your nostrils - it will relax you also.
724009
It usually improves the tone of a jazz or rock singer. There's no benefit to a classical / opera singer\n\nbut then it decreases your lung capacity, so isn't so good for sustained phrases for anyone.\n\ndon't start smoking to improve your voice anyway, i've smoked for 10 years and i'm trying to give up now. it's hell!
827695
Its a very inert, extremely low density element which is low on the periodic table and gaseous at common atmospheric temperature and pressure. And when you breath it in it makes you talk funny. That last one is most important.
94588
It depends on various factors but most important would be pressure. As the balloon ascends into the upper atmosphere pressure is slowly reduced as the air gets thinner farther up the balloon goes, Pressure within the balloon where the helium is held soon expands out as the air molecules in the atmosphere reduces and at one point it will burst as the helium expands past the stretchability limit of the balloon. So it depends on how strong the balloon fiber is, how much helium is stored within the balloon, how thin is the surrounding atmosphere compared to pressure within the balloon and also if the balloon meets any obstruction on its way up.
156918
Helium is an inert gas that is lighter than air and can be inhaled briefly without risk of death. Sound is produced by vibration, the movement of air around our vocal chords. Because helium gas is lighter than the usual oxygen/nitrogen blend, it changes the resonant frequency of the human vocal tract, causing a faster vibration and a higher-pitched, cartoon-character sound.