# The Naked Scientists Forum

### Author Topic: helium filled balloons  (Read 3151 times)

#### paul.fr

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##### helium filled balloons
« on: 09/04/2007 17:57:19 »
How high can a helium filled balloon fly before it bursts?

last summer i filled a black refuse bag bith helium balloons and watched it until i could no longer see it. It seemed to go pretty high, when i could no longer see it i wonder if i simply popped or went so high/far that it was out of range of my eyesight.

#### another_someone

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##### helium filled balloons
« Reply #1 on: 09/04/2007 23:31:34 »
Rather depends how full you fill the balloon, and how elastic the balloon is.

If you only half fill a balloon with helium, it will have more room to expand before bursting the balloon (assuming there is enough helium in the balloon to offset the weight of the balloon).

The moral of the story is only fill the balloon with the minimum amount needed to lift the weight of the balloon.

#### Karen W.

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##### helium filled balloons
« Reply #2 on: 11/04/2007 05:15:16 »
That is interesting.Does the air pressure cause the gas to expand in the balloon or does it just increase the pressure and cause it to break. I am assuming since you said it will have more room to expand that the gas increasees. why? Does heat have anything to do with it, does the pressure heat the helium up to cause the expansion??

#### another_someone

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##### helium filled balloons
« Reply #3 on: 11/04/2007 07:03:41 »
That is interesting.Does the air pressure cause the gas to expand in the balloon or does it just increase the pressure and cause it to break. I am assuming since you said it will have more room to expand that the gas increasees. why? Does heat have anything to do with it, does the pressure heat the helium up to cause the expansion??

The pressure within balloon is in fact the difference between the pressure inside the balloon and the air pressure on the outside of the balloon.  As the balloon rises, the pressure exerted on the outside of the balloon is reduced, so the difference in pressure between the outside and the inside increases, causing the helium within the balloon to expand against the reduced outside air pressure.

#### neilep

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##### helium filled balloons
« Reply #4 on: 11/04/2007 13:12:17 »
It's a well known fact that migrating geese latch onto helium filled balloons for three reasons:

1: They think they are pretty and geese have a proclivity for colour matching and design

2: They enjoy the rest as they float upon balloon joy & luff

3: They like to inhale the gas and do impressions of Sparrow chirps !

yes..this is all true.

#### Karen W.

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##### helium filled balloons
« Reply #5 on: 11/04/2007 16:44:30 »
Thanks George!!!

Neil... LOL HEE HEE HEE!!I would enjoy the empressions!!! LOL

#### The Naked Scientists Forum

##### helium filled balloons
« Reply #5 on: 11/04/2007 16:44:30 »