# The Naked Scientists Forum

### Author Topic: how does the water in a water balloon behave in zero gravity?  (Read 2204 times)

#### paul.fr

• Guest
##### how does the water in a water balloon behave in zero gravity?
« on: 06/12/2008 23:33:08 »
Two questions about how the water in a water balloon would act in zero gravity.

What would happen if an astronaut held out a water balloon and then popped it with a pin?

What would happen if the same astronaut threw a second water balloon at his colleague?

#### Don_1

• Neilep Level Member
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• A stupid comment for every occasion.
##### how does the water in a water balloon behave in zero gravity?
« Reply #1 on: 06/12/2008 23:41:33 »
If you watch an ultra slowmotion film of a water filled balloon being popped in normal Earth gravity, you will see the water retains it's shape for a spilt second. In zero gravity I should think apart from the disturbance caused by the balloon rubber returning to it's unstressed size, the water should retain it's shape.

#### Bikerman

• Sr. Member
• Posts: 119
##### how does the water in a water balloon behave in zero gravity?
« Reply #2 on: 07/12/2008 00:40:59 »
In zero g then the water will act to form a sphere (minimum surface area per volume). The balloon will simply reinforce this behaviour....

#### lyner

• Guest
##### how does the water in a water balloon behave in zero gravity?
« Reply #3 on: 07/12/2008 12:44:13 »
One large sphere would be very unstable* but, in a big enough container (removing local gravity effects) with perfectly still air surrounding it, it would stay spherical.
In orbit (microgravity) the shape would be slightly ellipsoidal (prolate / 'egg' shape) with the long axis pointing  towards the centre of Earth.

*There are many Utube Movies which show this sort of thing. C4 yourself.

#### The Naked Scientists Forum

##### how does the water in a water balloon behave in zero gravity?
« Reply #3 on: 07/12/2008 12:44:13 »