An inflated gas balloon is placed in a jar which is connected to an evacuating pump. What will be observed if the air inside the jar is pumped out ? Give a reason justifying your answers.

Ans. When the air in the jar is pumped out, the balloon will expand rapidly and burst. This is because of the following reason. The balloon contains gas at a pressure which is more than the atmospheric pressure, i.e., the pressure outside the balloon. This atmospheric pressure opposes the pressure of the gas inside the balloon. When the air in the jar is removed there is no opposition to the pressure exerted by the gas in the balloon, thus it expands rapidly and bursts.

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