How And Why Do Helium Balloons Fly Away In The Air?

Croatia (Hrvatska)
February 29, 2008 12:22pm CST
There is something incredibly neat 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 can't see it anymore. Why it flies away?
1 person likes this
3 responses
@jhl930 (3601)
• United States
29 Feb 08
I have noticed what you are talkign about...i mean regular balloons that you blow up never seem to fly away...but i think that something in the helium makes it rise..so whenever you put helium in a balloon(which is something that is a very light object)it just automatically rises because like i said something in helium makes it rise...and with it being such a light weight object it doesn't take much to make it fly...
• Croatia (Hrvatska)
29 Feb 08
You say something in helium makes it rise. But there is nothing in helium. It is an atom. You can find something in molecules, but in atoms you can't.
• Canada
29 Feb 08
While I don't know the scientific explanation, I can tell you one thing. When I asked the same question as a really young child my parents explained to me that helium balloons fly away because helium is lighter than the oxygen and CO2 that makes up the air that we breathe.
1 person likes this
• Croatia (Hrvatska)
29 Feb 08
Nice explanation, thanks
@goldeneagle (6745)
• United States
29 Feb 08
Helium is lighter and less dense than the air in the atmosphere