If you look at the periodic table (Periodic table - Wikipedia) you’ll notice that hydrogen is the first element. This is because it has only one proton which gives it a very low atomic mass. A spherical balloon of radius 3 cm containing helium gas has a pressure of 48 × 10^–3 bar. At the same temperature, the pressure, asked Sep 11, 2020 in Chemistry by AmarDeep01 ( 50.1k points). A balloon filled with helium gas has an average density of ρ b = 0.26 kg/m 3. The density of the air is about ρ a = 1.23 kg/m 3. The volume of the balloon is V b = 0.024 m 3. A balloon is filled with helium gas with a partial pressure of 1.00 atm and neon gas with a partial pressure of 0.50 atm. For each of the following changes of the initial balloon, select the diagram (A, B, or C) that shows the final volume of the balloon: (8.2,8.3,8.4,8.6)a. The balloon is put in a cold storage unit (P and n constant).
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Helium Balloons are a popular decoration at many events, such as birthday parties and weddings. They are also popular with children, who enjoy holding them (and letting them go). When a helium balloon is released it floats and rises in the air. Have you ever wondered why this occurs? Read this article to find the answer.
A spherical balloon is filled with 4500π cubic meters of helium gas. If a leak in the balloon causes the gas to escape at the rate of 72π cubic meters per minute, then the rate (in meters per minute) at which the radius of the balloon decreases 49 minutes after the leakage began is 9/7 7/9.
Why does a helium balloon float in the air?
When a balloon is inflated using normal air it does not rise unless it is thrown into the air and it quickly returns to earth. However, if you inflate a balloon using helium it will quickly rise through the air. The simple reason for this is that helium is lighter, or more correctly less dense, than air. A helium filled balloon will essentially float on the air.
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A good way to explain this idea is to think about floating and sinking. When an object such as a beach ball is placed into water it pushes away some water. The force of the water pushing back into that space is greater than the force of the beach ball pushing down and this means that the beach ball stays afloat. If a heavy object such as a rock is placed in the water the force of the water pushing back into the space is to enough to equal the force at which the rock is pushing down so it sinks.
The reason that a helium balloon floats is that helium is a gas that is much less dense than air. The molecules that make up helium are smaller, lighter and take up less space that air, which makes it less dense than air. The force of a helium filled balloon pushing down on the air is not enough to counteract the force of the air pushing it up. These causes the helium balloon to rise or float just like the beach ball. A balloon full of air sinks because the mass of the air inside the balloon is greater than the force of air outside the balloon. So it sinks because the air pushing back into the space does not have enough force to stop the fall of the balloon.
The following further explains this phenomenon:
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We’ve all let go of a latex helium balloon, whether intentionally or by accident, but what happens once that helium balloon soars out of our vision?
Why does a helium balloon float?
A filled helium balloon rises because of the simple fact that helium is lighter than air.
What happens to the helium balloon as it rises?
As altitude increases, the density of the atmosphere decreases. So as a latex helium balloon rises, the outside air pressure diminishes, while the pressure from inside of the balloon remains the same. This causes the elastic material of the latex helium balloon to expand.
As the latex expands, the helium balloon increases in volume, thereby increasing its buoyancy. The more a balloon’s material can safely expand, the higher it will rise.
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How high can a helium balloon go?
This depends largely on the material of the helium balloon. One made of a stronger latex will be able to expand (and ascend) more than one that is made of a weaker latex.
In a 1992 study of a test of toy balloons for the Federal Department of Aviation, researchers found that latex helium balloons can rise to an altitude of 5.7 miles to 6.6 miles before popping.
What happens when the helium balloon pops?
Inflate a helium balloon indoors until it pops and you’ll be left with relatively large pieces of rubber. Do it 5 miles up in the air and something quite different happens.
When a latex helium balloon reaches the low temperatures within that 5-6 mile altitude range, it will actually freeze. The elasticity of latex decreases significantly in low temperatures, so the helium balloon that was expanding suddenly becomes incredibly brittle.
What happens next is not the traditional pop that you and I are used to seeing, but instead something simply called “shattering.” The helium balloon breaks in a manner that is similar to smashing a mirror, and all that is left are very small pieces of cold latex that sprinkle back down to the planet.
(It’s said that these shattered pieces are too small to pose any threats to animals because they are easily passed through the system if ingested.)
Variables
Of course, there are exceptions. Variables that can throw a hitch in these rules include poorly manufactured or flawed latex, latex that is unable to expand significantly or expands too quickly, helium balloons that are not fully inflated, or the altitude and climate of the place from which the balloon was released.
What about a foil helium balloon?
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Due to their shattering capability, professionals will only use 100% biodegradable latex balloons during intentional releases so that large pieces of material are not left littering the ground or water. This latex biodegrades in the same amount of time as a fallen leaf.
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But accidental or unprofessional releases of other balloons like foil do happen.
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In the same 1992 study referenced earlier, mylar balloons rose only to about 3,280 feet, with some reaching a maximum of 1.5 miles, where they would eventually either burst open or simply “lose their lift” and glide back down to Earth.
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Source: Test of toy balloons performed for Federal Department of Aviation via balloonhq.com