0
Why does a balloon expand until the pressure of the gas inside balloon balances the pressure of the gas outside?
In a closed container where air or other gases tend to occupy space, there is the presence of air pressure that does an upward force. This force exerted inside the balloon able the balloon to fly, but there is an opposing force outside it, which is also air pressures. Hence, the air pressure inside the balloon must be greater than the air pressure outside it, for the balloon to be lifted up.
I'm not sure this guy ^ answered your question or not. Actually, it's completely wrong. If you ARE talking about helium balloons, as he seemed to be, then Helium is a lighter gas than the combined gases in the air. Just like mixing olive oil and water, denser objects sink, and lighter objects float. Therefore, a helium balloon will float upwards until it pops.
If you WEREN'T talking about helium balloons, which I don't think you were, then you're like me. I've been doing some research to prove my theory. While hard to find, it seems to be pretty common knowledge in science (and yet, for some reason, my teacher was wrong about it - hence me doing outside research) that a balloon has a greater air pressure inside the wall than that outside.
Air pressure, technically, is a measurement of the amount of collisions against a surface at any time. In the case of balloon, it's supposed to measure how many particles at any in any given time space collide with the wall of the balloon and bounce off. However, since this is near impossible to measure, air pressure seems to be easier described as density. The similarity comes from the idea that when there are more molecules in the same space, more of them will be heading towards a collision course with the wall.
The first concept of air pressure within a balloon that you will need to know is that air pressures "try" to even out. With all the bouncing against the balloon wall (both in and out) there will be a certain amount of expansion/contraction. As air pressure itself is a description of the total forces against an object, each of these forces, on the outside of the balloon, causes the balloon to contract a tiny bit, while the inside forces cause the balloon to expand. With this knowledge, one would immediately assume the a balloon with high air pressure inside would expand based on the high amount of internal forces, and vice versa.
This would make the inside and outside air pressures equal.
However, the part I am looking for, that my science teacher doesn't agree with, is the fact that we are, after all, talking about balloons. Balloons have a certain elasticity to them that some won't take into account. When you stretch a balloon, you're filling it with potential energy. When you let it go, the potential energy is turned into kinetic energy and the balloon snaps back into its original position (though perhaps a little stretched out).
When you fill up a balloon with air, the balloon is being stretched. While the balloon is constantly releasing kinetic energy in an attempt to contract, it is also being pushed back out by the constant bouncing of the internal air molecules.
Because I'm still researching this, I'm not an expert, but basically, the internal air has to exert force not only to counteract the external air to keep the air pressures "even," but it also has to counteract the natural contraction of the balloon. Therefore, it requires more air pressure (more force) than the air outside the balloon wall.
________________________________________________________________
the gas pressure inside an inflated balloon always greater than the air pressure outside because as the atoms and molecules move about they hit the wall of the balloons which increases their speed so the gas pressure is higher then outside. The air pressure outside the wall is less because atoms and molecules can easily move about. When most of the atoms and molecules escape from the balloon the air becomes same outside and inside.
________________________________________________________________
Okay, no, that ^ just doesn't make any sense. Hitting the balloon wall does not increase speed. Also, the air outside the balloon is generally confined too. It is bouncing off the balloon, all of the objects in it's area, possibly walls and a ceiling...
And, according to your theory, if air is let out, what's left would still have a greater pressure, because it's still hitting the walls...not that this 'theory' makes any sense...
What else can I help you with?
Why does a partially inflated balloon expand as it rises?
As the balloon rises, the air pressure outside the balloon decreases while the air pressure inside the balloon stays the same. This causes the balloon to expand because the higher pressure inside the balloon pushes against the lower pressure outside.
What would cause a balloon to expand if taken to the of a mountain?
Lowered Pressure
Why does a partially inflated weather balloon expand as it rises?
As the weather balloon rises in altitude, the air pressure around it decreases while the pressure inside the balloon remains relatively constant. This pressure difference causes the gas inside the balloon to expand, increasing its volume and size.
Why does the pressure outside the balloon decrease as it rises?
The pressure outside the balloon doesn't change when the balloon rises. By a balloon rising, I assume that air is being placed into the balloon. As the balloon fills with air, the pressure inside the balloon will increase. Since the balloon can stretch, the increasing pressure against its inner walls will cause it to rise, or more correctly put, expand. Eventually, the balloon will be stretched to its fullest capacity if more air is placed inside it. When it pops, the bang you hear is the high pressure of the atmosphere inside the balloon equalizing with the lower pressure of the atmosphere outside the balloon.
As a balloon rises does the presure inside the bag of balloon increases or decreases?
As a balloon rises, the pressure inside the balloon decreases. This is because the atmospheric pressure outside the balloon decreases with altitude, causing the balloon to expand as the pressure inside remains relatively constant.
Why does a partially inflated balloon expand as it rises?
As the balloon rises, the air pressure outside the balloon decreases while the air pressure inside the balloon stays the same. This causes the balloon to expand because the higher pressure inside the balloon pushes against the lower pressure outside.
What would cause a balloon to expand if taken to the of a mountain?
Lowered Pressure
Why does a partially inflated weather balloon expand as it rises?
As the weather balloon rises in altitude, the air pressure around it decreases while the pressure inside the balloon remains relatively constant. This pressure difference causes the gas inside the balloon to expand, increasing its volume and size.
Why does the pressure outside the balloon decrease as it rises?
The pressure outside the balloon doesn't change when the balloon rises. By a balloon rising, I assume that air is being placed into the balloon. As the balloon fills with air, the pressure inside the balloon will increase. Since the balloon can stretch, the increasing pressure against its inner walls will cause it to rise, or more correctly put, expand. Eventually, the balloon will be stretched to its fullest capacity if more air is placed inside it. When it pops, the bang you hear is the high pressure of the atmosphere inside the balloon equalizing with the lower pressure of the atmosphere outside the balloon.
Why does a balloon expand when adding Co2?
When CO2 is added to a balloon, it has a higher pressure compared to the surrounding air. This pressure difference causes the balloon to expand because the air inside is pushing against the walls of the balloon more forcefully than the air outside.
Why do balloons expand when they go higher?
Balloons expand when they go higher because the air pressure outside the balloon decreases as altitude increases. This decrease in air pressure causes the gas inside the balloon to expand to occupy a larger volume, leading to the balloon expanding in size.
As a balloon rises does the presure inside the bag of balloon increases or decreases?
As a balloon rises, the pressure inside the balloon decreases. This is because the atmospheric pressure outside the balloon decreases with altitude, causing the balloon to expand as the pressure inside remains relatively constant.
A balloon placed in which condition will be the largest?
A balloon placed in a condition of low pressure will be the largest. This is because the lower the pressure of the surrounding air, the more the balloon will expand to equalize the pressure inside and outside of the balloon.
Why does an inflated balloon inflate inside a bell jar?
An inflated balloon will inflate inside a bell jar because the air pressure outside the balloon is reduced when the bell jar is sealed. This creates a pressure difference between the inside and outside of the balloon, causing the air inside the balloon to expand and inflate it.
What will change the size of the weather balloon as it rises?
The pressure of the air inside it. The higher the balloon rises, the lower the outside air-pressure. With less pressure outside, the balloon expands because of the pressure of the air inside it. Eventually, the balloon bursts, and scientists recover the instruments when they fall to earth.
What has to happen for a balloon to inflate?
A balloon inflates when it is filled with a gas, such as helium or air, creating pressure inside the balloon which causes it to expand. The gas molecules inside the balloon push against the walls, causing it to stretch and increase in size.
Why does a balloon change size and shape when you blow it up with gas?
When you blow gas into a balloon, the gas fills the balloon and creates pressure inside, causing it to expand and stretch. The balloon changes shape because the rubber is flexible and can mold around the gas inside. As more gas is blown in, the balloon will continue to expand until the pressure inside is equal to the pressure outside.
