Поиск

Полнотекстовый поиск:
Где искать:
везде
только в названии
только в тексте
Выводить:
описание
слова в тексте
только заголовок

Рекомендуем ознакомиться

Остальные работы->Реферат
What is shame? According to the New International Webster s Pocket Dictionary of the English Language shame means, a painful feeling caused by a sense...полностью>>
Остальные работы->Реферат
You can?t hardly find anyone who hasn?t tried oregano, because it is used in almost all kinds of pizza sauces and any kind of tomato sauces. But in th...полностью>>
Остальные работы->Реферат
The six-day, Arab-Israeli War of 1967, was an important event in modern Middle East history. This paper will analyze the causes of this “definitive ev...полностью>>
Остальные работы->Реферат
In the play, The Crucible, Authur Miller develops numerous conflicts between characters. Miller sets his play in Salem Massachusetts, an environment w...полностью>>

Главная > Реферат >Остальные работы

Сохрани ссылку в одной из сетей:

How Helium Works Essay, Research Paper

How Helium Balloons Work

There is something incredibly special about helium balloons! If you buy one at the circus or fair, you can hold its string and it will ride along above you. If you let go of the string it will fly away until you cannot see it anymore. If you have ever wondered why it flies away, the passages below can help you to figure out the mystery.

Helium floatation

Helium balloons work using exactly the same law of buoyancy. In this case, the helium balloon that you hold by a string is floating in a “pool” of air. The helium balloon displaces an amount of air (just like a empty bottle displaces an amount of water). As long as the helium plus the balloon is lighter than the air it displaces, the balloon will float in the air. It turns out that helium is a lot lighter than air. The difference is not as great as it is between water and air (a liter of water weighs about 1,000grams, while a liter of air weighs about a gram), but it is significant. Helium weighs 0.1785 grams per liter. Nitrogen weighs 1.2506 grams per liter, and since nitrogen makes up about 80% of the air we breath, 1.25 grams is a good approximation for the weight of liter of air. Therefore, if you were to fill a one-liter soda bottle full of helium, the bottle would weigh about 1 gram less than the same

Chan 2

bottle filled with air. That doesn’t sound like much – since the bottle weighs more than a gram the bottle will not float. However, in large volumes, the 1-gram per liter difference between air and helium can really add up. This explains why balloons are generally quite large – they have to displace a lot of air to float.

So why is helium so much lighter than air? It’s because helium atoms are lighter than a nitrogen atom. It has fewer electrons, protons and neutrons than nitrogen atoms do, and that makes it much more lighter. Approximately the same number of atoms of each of the elements fills approximately the same amount of space. Therefore, the gases made of lighter atoms are lighter.

If you put helium in a balloon and let go of the balloon, the balloon rises until it pops. When it pops, the helium that escapes has no reason to stop – it just keeps going and leaks out into space. Therefore, in the atmosphere there is very little helium at any given time. The helium comes from alpha particles emitted by radioactive decay. Since the decay of uranium emits lots of alpha particles and a natural gas pocket tends to be a sealed container underground. Helium is then carefully distilled out of natural gas to produce the helium we put in balloons. Helium is safe for balloons pumping because it is a very stable gas (Noble Gas). However, since the cost of extraction of helium is so expensive, this explains why a helium air balloon costs you quite a fortune when you buy it.


Загрузить файл

Похожие страницы:

  1. Hey Big Spenders Essay Research Paper Hey

    Реферат >> Остальные работы
    Hey, Big Spenders Essay, Research Paper Hey, Big Spenders Tara Joyce ... About You and The Simpsons. Helen Hunt and Paul Reiser, ... up. “The middle- class working professional actor in this industry ... continues, it will destroy the working heart of the business.” ...
  2. Helen Keller Essay Research Paper Imagine a

    Реферат >> Остальные работы
    Helen Keller Essay, Research Paper Imagine a life without being able ... or hear and not knowing how to communicate with anyone around ... , Helen Keller International is one of the biggest organizations that works with ...
  3. Halloween Storm Essay Research Paper Halloween Storm

    Реферат >> Остальные работы
    Halloween Storm Essay, Research Paper Halloween Storm 1991 The Storm?s beginning It was Halloween Eve 1991, the ... ? I learned more about how the physical world works and how hurricanes work and ... Pg 1-3. This article talks about how much the damages would cost ...
  4. Essay Essay Research Paper IntroductionGlobal warming is

    Реферат >> Остальные работы
    Essay Essay, Research Paper Introduction Global warming is not a ... (RMI), a Colorado-based environmental research group. Another 21,000 pounds ... gas this one is called halon-1211, emissions of this gas ... what global warming is and how it works, let’s try to see ...
  5. Lillian Hellman Essay Research Paper Comparing Lillian

    Реферат >> Остальные работы
    ... Hellman Essay, Research Paper Comparing Lillian Hellman s The Children s Hour and The Little Foxes. Lillian Hellman ... creates a new dimension in viewing Hellman’s works. Here, it seems as if ... might conclude that Hellman focuses on emotion to show how much of ...

Хочу больше похожих работ...

Generated in 0.0014948844909668