At what point does a helium filled balloon stop rising?
487947
Helium is a gas that is ONLY found trapped inside rocks ( on Earth ).\n\nThis is because Helium is so light that it will escaped into SPACE when released.  ( Helium is not found in the air )\n\nYour helium balloon will explode before it stops rising.\n\nIf the balloon doesnt explode ( for example only ) , then it will rise into space and stabilize in a orbit at an equilibrium point where the gravitational attraction of the Earth to the substance of the balloon matches the lift of the balloon ( the tendency of Helium to escape ).\n\nI dont know where this point would be but i dont think its necessary to understand your question.
856659
Helium is a lighter gas than the nitrogen/oxygen that our atmosphere is composed of, so a helium balloon will naturally float up.  It pops because the gas inside the balloon expands as the balloon rises to higher altitudes where the air pressure is lower.
856916
At the end of the parade, you'll be able to see the balloon deflation on side streets near the parade route. They just release it into the air.
541309
Your voice raises when you inhale helium, because it is less dense than the air that you breath normally.  Since it is less dense, the speed of sound is higher, this makes the pitch rise. Air is mostly nitrogen (atomic weight 7), which is 350% heavier than helium (atomic weight 2). So, about 350% higher.
719389
since the all of the valance orbitals are filled, helium is much more stable than hydrogen. therefore, i wont explode or catch on fire or anything dangerous
282829
This is similar to asking why gravity doesn't affect boats. It does, but buoyancy keeps them above water. Similarly, if you push a hollow rubber ball down to the bottom of a pail of water and simply release it, it will pop back up to the surface.\nThe helium balloon is just being pushed up by the relatively higher air pressure under it. See the sources for a detailed calculation and a diagram of the pressure situation.
182931
Lift under a liquid (or BOUYANCY FORCE) is defined as the weight of the volume of liquid displaced.  In other words, say a ball displaces 1 cubic meter of water.  The ball will be pushed back up with the same amount of force as the weight of that 1 cubic meter of water.\n\nSince water's density is 999 kg/cubic meter, we're looking at 999 kg of water (water is really heavy!).\n\nNow if we want the force of that water, we'd simply multiply it by the gravitational acceleration, 9.8 m/s/s:\n\n999 * 9.8m/s/s = 9790 Newtons (1 Newton = 1 (kg * m)/(s^2))\n\nSo the ball would be pushed back up with a force of 9790 Newtons.\n\nNow, the hard shell ball will (theoretically) not deform when subjected to the pressure of 10 feet of water.  So the *bouyance force* placed on the hard shell ball is easy to calculate, given the formula above.\n\nThe latex balloon, however, will shrink as it is exposed to increasing pressure, so the volume of water it displaces will be smaller. (I will not solve that problem here as it takes up quite a bit of space to show how much a balloon shrinks as it is subjected to increasing pressure.  Essentially it comes down to writing a spherical force balance and integrating over volume)\n\nConsequently, the bouyancy force exerted on the latex balloon will be smaller, and the ping pong ball would be forced back up through the water harder (and faster) than the balloon.\n\nAs an extreme, ever wondered what happens to helium filled balloons when they are released into the air and they float up until you can't see them anymore?  Since the atmospheric pressure is lower and lower the higher you go, the balloon expands until eventually it pops.  At that point, the popped balloon either falls back to earth or gets swept up into atmospheric currents, which can take it basically anywhere on earth.
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.
43871
There is a popular toy called a rocket balloon.  It is about 40" long and when you release it, it shoots up in the air and then winds it's way down as it slowly deflates while making a loud airplane type noise.  I've included a link to a picture below.  I'm not sure if this is what you're looking for but it's what came to mind.
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 :)
140469
The helium balloon will continue to travel forward until it collides with the right side of the van that is now moving towards the balloon.  Once the side of the van and the balloon meet, the balloon will travel to the left.\n\nFrom the perspective of someone in the van, the balloon will APPEAR to move to the right.
899047
not so bad really. Eventually enough helium will leak out and the balloon will come down.\nThe balloon is so fragile I doubt it would hurt an airplane. \nMy only concern is what happens when the balloon comes down. Most of them are at least partially latex and that stuff takes a long time to break down. I do hope birds and other creatures don't get tangled in them, but I have never heard of such a thing.
726772
Its a trick Q...\n1. If floating on Surface, then 0 (since ur ballon is massless, although theoretically, nothing is massless..)\n2. If forced to stay inside water, then it would be equal to the weight of water displaced (i think ur Q is phrased wrongly, it is 1000cm3 displaced water ( or else the answer depends on the volume of the balloon).. Or simply, it is equal to the force used to keep the balloon inside water.
1109852
On June 3, the bodies of two college students were found in a giant helium balloon in Florida. The week before, a 10-year-old in New Jersey collapsed at a birthday party after sucking helium from a balloon. Is helium really that dangerous?\n\nIt can be. Breathing in pure helium deprives the body of oxygen, as if you were holding your breath. If you couldn't breathe at all, you'd start to die in minutes—as soon as your body exhausted the supply of oxygen stored in the blood. But helium speeds up this process: When the gas fills your lungs, it creates a diffusion gradient that washes out the oxygen. In other words, each breath of helium you take sucks more oxygen out of your system. After inhaling helium, the body's oxygen level can plummet to a hazardous level in a matter of seconds.\n\nYou don't have to worry about fatal asphyxiation if you're sucking from a helium balloon at a party. At worst you'll keep going until you get lightheaded and pass out—at which point you'll stop inhaling helium and your body's oxygen levels will return to normal. Of more concern is the possibility that you'll hurt yourself when you fall down. (The boy in New Jersey bumped his head and needed three stitches.) It's far more dangerous to suck helium out of a pressurized tank: If the gas comes in too quickly, your lungs might burst and hemorrhage.\n\nOf course you're putting yourself in grave danger anytime you climb inside a giant helium balloon. The college kids in Florida weren't the first to attempt this stunt. In 2002, a case report from a Japanese medical journal described a similar episode: A drunken adolescent poked his head into an advertising balloon and asphyxiated. Several authors have also reported cases of suicide by helium inhalation. \n\nDeath by helium still seems to be quite rare. U.S. Poison Control Centers reported only two fatalities between 2000 and 2004. There's still an outcry from concerned parents whenever helium inhalation makes its way into popular culture. Federal Express had to pull a commercial that depicted the munchkins from The Wizard of Oz sucking balloons to keep their voices at a high pitch. Geoffrey, the Toys "R" Us giraffe, got a slap on the hoof for doing the same. \n\nAt the same time, doctors use a mixture of helium and oxygen (called "heliox") to help patients with upper-respiratory blockages. The treatment works because the helium is a very light gas, and it's easier to push it through an obstructed airway. (We get funny voices when we inhale helium because the lighter gas changes the resonant frequencies of our vocal tract.*)
891931
initially only 10-29% of air is filled because the air inside is heated it naturally expands and occupies the rest of the volume when it expands the density of helium decreases and hence the baloons goes up because the density of air inside is leser then the air outside
176876
The gas in the balloon is helium. These helium atoms were once the alpha particles of radioactive decay trapped with other particles beneath the ground in natural gas deposits. For each uranium atom that decays to lead, 8 alpha particles are emitted. An alpha particle with 2 electrons is a helium atom.
265540
While helium itself doesn't actually defy gravity, it is lighter than air and floats upward as descending air pushes it out of the way. Like a bubble in water, the helium goes up to make room for the air going down. The buoyant force that acts on the helium is equal to the weight of air that the helium displaces.\n\nA cubic foot of air weighs about 0.078 pounds so the upward buoyant force on a cubic foot of helium is about 0.078 pounds. A cubic foot of helium weighs only about 0.011 pounds. The difference between the upward buoyant force on the cubic foot of helium and the weight of the helium is the amount of extra weight that the helium can lift; about 0.067 pounds. Since you weigh 85 pounds, it would take about 1300 cubic feet of helium to lift you and a thin balloon up into the air. That's a balloon about 13.5 feet in diameter.