Question

what do you think will happen to a ballon which shrink

Answer 1

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☄ If the temperature is constant, if pressure goes down, volume will go up (balloon expands).

☄ If T is constant, and the pressure goes up (say you hold the balloon underwater), then V will go down (balloon shrinks).

☄ If the volume is constant (say, an aerosol can) and the temperature goes up, then P goes up.