Question

Water is filled upto same height in to identical closed containers A and B. Container A has vacuum over the water while container B has air over the water. At the same depth of both containers two identical balloons are attached with the opening of the container which balloon bulges?

Answer 1

Of the containerA
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Answer 2

In container A where there is vacuam, the balloon bulges. Because in the container where there is vacuum, the pressure is 0. But inside the balloon, it has some amount of pressure. Pressure gradient is created. To neutralize the pressure gradient, the balloon bulges in the container A and the balloon will eventually stick to the wall of the container if stretching extent permits.