You are quite right. Some of the water in the breath of whoever blew up the balloon may condense on the inner wall of the balloon and reduce the pressure even more than predicted by the ideal gasd law. If the ballon were helium-filled, moisture would not ne a factor.
It it the lower pressure (at reduced temperature) and the elastic tension of of the balloon wall that causes the volume to shrink.
Blow up a balloon & tie it up. Measure its diameter with a measuring tape. Place it in a freezer for at least an hour.Predict what happens to the balloon after some time in the freezer when its diameter is measured again.
The answer given is,"The balloon becomes smaller.Particles lose energy and become closer and the air contracts, causing the balloon to become smaller."
Why won't some water vapour in the balloon condense to give water droplets & freeze to give some ice?
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