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I blew up a rubber balloon and a foil balloon and measured their circumference over a period of four days. The foil balloon deflated more. I am not sure how to explain why the foil balloon allowed more air out than the rubber one. Any ideas?
Answer 1:

I think probably the biggest factor is the opening that you tie together. The foil balloons are harder to close. I believe in the stores where they blow up the foil balloons they have some special way of closing them.

I suggest the first thing you should check is the way the balloons are closed. The rubber ones are usually easier to tie really tight.

Good luck

Answer 2:

Interesting observation!

Obviously, the foil balloon was losing air more rapidly than the rubber balloon. Either the rubber is actually less permeable to air, or else there is a leak in the foil balloon. How was your foil balloon constructed?


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