|If you place a water balloon in a low pressure
environment, will that push all of the air out of
the balloon? If not, would there possibly be
another way to remove the air from the filled
The air inside the water balloon is made up of
many gas molecules flying around. Once you tie the
balloon, the air inside can’t escape, so the
number of molecules stays the same. How far apart
the molecules are depends on the pressure outside
of the balloon, which presses the balloon inward.
If you place the balloon in a low pressure outside
environment, there is less force pushing the gas
molecules together, and the balloon expands. So,
it will look like there is now more air in the
balloon! You still have the same number of gas
molecules in the balloon, but they are farther
apart and take up more space.
To remove the air in
the water balloon, fill it up with a little too
much water, and then carefully let the air and a
little water out before tying the balloon.
If the air inside of the balloon is at higher
pressure than the surrounding air, then it will
try to escape, and may pop the balloon if the
pressure is too great. The water will have no
If the water balloon is sealed, air cannot
escape from it even in a low-pressure environment.
(At least, not quickly: over days or weeks, air
may escape through the walls of the balloon
because the fabric of the balloon is slightly
If you want to remove air from a water balloon
quickly, you will have to create an opening for
the air to escape. A simple way to do that would
be to use a syringe. If you can push it into the
opening of the balloon, you can draw air out of
the balloon and into the syringe, then remove the
syringe and discard the air, and repeat.
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