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

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

Some common words found in the essay are:
Helium Balloons, Noble Gas, helium balloons, air helium, helium balloon, lighter air, grams liter nitrogen, helium lighter air, liter nitrogen, atoms lighter, weighs gram, alpha particles, natural gas, displaces amount,
Approximate Word count = 542
Approximate Pages = 2 (250 words per page double spaced)