Now, considering you are asking this question, I presume you can't undo knots otherwise you would have tried it yourself. If the balloon is filled with helium (the stuff that makes your voice higher pitched) then it should rise, but it would probably rise without the string being untied it that particular instance. If however you or someone else used their own breath to blow up the balloon then it will fall to the ground, which it will also do even if the string is attached (but only to the balloon mind).
Ugly lady is sleeping
it will deflate :(
The pressure inside the balloon has to exceed the pressure outside the balloon.
Balloon Bomber happened in 1980.
Usually the balloon will burst.
first thats a stupid ? but anyway u just put air in the balloon and get a string and hold the balloon with the hand that you write with and the string with the other and on the bottom of the balloon you but the string on that part and yank the string as fast as you can!!
Ugly lady is sleeping
invisible string
it will deflate :(
When the balloon was to close to the light it will rupture from the string
Probably it would drop on the ground, because the moon has no atmosphere.
The pressure inside the balloon has to exceed the pressure outside the balloon.
Balloon Brothers happened in 1992.
Balloon Kid happened in 1990.
Balloon Man happened in 1996.
Crazy Balloon happened in 1980.
Balloon Bomber happened in 1980.