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If I fill an 11 inch latex balloon to only around 5 to 6 inches of air will it deflate more quickly than if it was filled to full capacity?
Yes, if you fill an 11 inch balloon to just 5 or 6 inches, it will deflate faster than a fully inflated balloon.
In general, smaller balloons deflate more quickly than larger ones. That's because the ratio of the volume of air to the balloon's surface is lower in a 5 inch balloon compared to an 11 inch, for example.
In other words, a smaller number of air molecules in the balloon have a larger area where they can escape.
I don't think it makes any difference whether you use a 5 or 6 inch balloon and inflate it fully or underinflate an 11 inch balloon.
Here are some tips how you can make small air-filled latex balloons last longer (these tips apply to larger ones, too):
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