Question

Fish takes oxygen by taking dissolved oxygen which is present in water for its living. Then if fish takes Oxygen from H2O then H2O molecule breaks . So water must reduce . Why it is not reducing?

Answer 1

Water is a solvent. That means, it can dissolve things. This would also mean it can dissolve a lot of gases. Air is a mixture of gases, one of them including oxygen.

Air is relatively richer in oxygen than water. When air and water meet, the difference in their oxygen concentration causes some oxygen to dissolve in the water.so the water doesn't reduces.
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