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Ordinary rubber filled with hydrogen get...

Ordinary rubber filled with hydrogen get deflated after sometimes. Assign reason.

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Rubber is an elastic material which is of porous nature. However, the pores are so small in size tha they are not visible. In an inflated rubber balloon, the presence inside the balloon is gerater than the atmospheric pressure prevailing outside. As a result, `H_(2)` molecular will slowly effuse of the balloon leading to contraction in volume or size of the balloon.
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