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What happens when (1) H(2)SO(4) is kep...

What happens when (1) `H_(2)SO_(4)` is kept in an open vessel and (2) `H_(2)SO_(4)` is kept in a closed vessel ?

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(1) Concentrated `H_(2)SO_(4)` is hygroscopic in natuer. So, when it is kept in an open vessel, it absorbs mositure form air , and its concentration decrease.
(2) Change of concentration does not take place when `H_(2)SO_(4)` is kept in a closed vessel.
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