Why does air escape through a pinched ballon?

[scilearner]

Hello guys,

 

This is simple question but I have gone completely blank. Ok let's say there was a balloon outside that was inflated. This means that it has expandes so it's pressure is equivalent to atmpospheric pressure right?

 

So when I pinch it why does air escape, how does balloon suddenly have higher pressure to make air move out? Is pinching the balloon equivalent to making the volume of the ballon smaller. Thanks

[Moontanman]

No, the pressure inside an inflated balloon is greater than the surrounding atmospheric pressure, when you make a hole all the air rushes to go out to the lower pressure outside through hole.

[scilearner]

No, the pressure inside an inflated balloon is greater than the surrounding atmospheric pressure, when you make a hole all the air rushes to go out to the lower pressure outside through hole.

 

Thanks for the response If the balloon is in equilibrium how come its internal pressure is not equivalent to atmospheric pressure? Do you mean that the ballon does expand because it has higher pressure but it can only do that for a certain limit.

[Sisyphus]

Remember that you are stretching out the elastic balloon. The inside pressure has to fight both the outside pressure and the elasticity of the balloon. Think of stretching out or compressing a spring - to maintain a shape other than its nautral shape requires a constant force.

[scilearner]

Remember that you are stretching out the elastic balloon. The inside pressure has to fight both the outside pressure and the elasticity of the balloon. Think of stretching out or compressing a spring - to maintain a shape other than its nautral shape requires a constant force.

 

I see thanks for the help However the balloon might expand atleast a little bit if I suddenly decrease the atmospheric pressure right? It might not equalize it.

[Sisyphus]

Sure, if you decrease outside pressure, it should have the same effect as increasing inside pressure.

[Moontanman]

I see thanks for the help However the balloon might expand atleast a little bit if I suddenly decrease the atmospheric pressure right? It might not equalize it.

 

Yes, increase or decrease the ambient pressure the balloon will respond by getting larger or smaller, decrease the ambient pressure enough and the balloon will explode.

[Mr Skeptic]

Yes, increase or decrease the ambient pressure the balloon will respond by getting larger or smaller, decrease the ambient pressure enough and the balloon will explode.

 

Which helium-filled balloons will do when you release them and they float upwards to where the air is less dense.

[rooshidavid]

I state that any balloon filled with helium gas in good amount will go so denser but i thinks the perfect answer for this question is Promotional Balloons.

[insane_alien]

roosh, ummm what?

 

can you rephrase that so it makes sense?

[khaled]

Heat [math]\propto[/math] Pressure

 

also, Speed [math]\propto[/math] Pressure

 

gas inside the balloon escapes High-Pressure,

 

but if the balloon is kept under the water, it won't lose gas from its pressure, but because the high pressure of the water causes it to press on the balloon and enforce its gas to escape, but gas won't escape it if the container is solid ...

[insane_alien]

Heat [math]\propto[/math] Pressure

 

also, Speed [math]\propto[/math] Pressure

 

only in an isolated system, a balloon is not an isolated system.

 

but if the balloon is kept under the water, it won't lose gas from its pressure, but because the high pressure of the water causes it to press on the balloon and enforce its gas to escape, but gas won't escape it if the container is solid ...

 

this is muddled. gas can and will still escape underwater.

 

also, many gasses can diffuse through apparently solid materials. such as helium through steel.

[Moontanman]

Not to mention how fast helium difuses through a rubber balloon. Ever put propane in a balloon?

[khaled]

Ever put propane in a balloon?

 

it will be like "flying mines to heat", lol

[Moontanman]

it will be like "flying mines to heat", lol

 

Actually a balloon full of propane drops like a rock, propane is so heavy the behavior of a balloon full of it acts really weird after you have been used to balloons full of hydrogen or even air.