Rubber balloon filled with H(2) gas gets...

Rubber balloon filled with `H_(2)` gas gets deflated after some time-explain why?

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As rubber is a porous substance, a rubber balloon contains many invisible pores in its surface. The balloon contains `H_(2)` gas at high pressure. But the pressure of air outside the balloon being comparatively lower. As a result, `H_(2)` gas escapes from the balloon by effusion. this is why the pressure inside the balloon gradually falls and affter some time the balloon gets deflated.

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