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If you put plaster over a water balloon and freeze it, the water balloon will bulge out.
It Freezes ! :P
The balloon will contract.
it pops
it dies
The balloon shrinks because the molecules are moving slower
The air inside the balloon will contract, so the balloon will tend to look slightly crinkled.
it freezes.
It collaspses.
Your hair gives off electrons to the balloon and when you put the balloon close to your hair, it will go up and you can hear the static electricity.
the balloon will inflate
If you put an inflated balloon in a jar and then remove the air from the jar the balloon will expand. Perhaps to the point of bursting, or to the point where it coats the entire inner surface of the jar.