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How long will a 3ft balloon filled with air and lots of small balloons stay afloat for please?
Only balloons filled with helium float. Air filled balloons do not float.
The kind of exploding balloon you have in mind, also called a "balloon bomb," is normally suspended from the ceiling.
You can read more about creating and exploding this fun decoration on the page below, where I answered a similar question...
How to make a balloon bomb
Hope that helps,
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