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Why are aerated water bottles kept under...

Why are aerated water bottles kept under water during summer ?

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In aerated water bottles, `CO_(2)` gas is passed though the aqueous under pressure because the solubility of the gas in water is not very high. In summer, the solubility of the gas in water is likely to decrease because the rise in temperature decrease the solubility. Thus, in summer more of gas will be present above the liquid surface in the glass bottle. In case, the pressure of the gas become too high, then glass will not be abe to withstand the pressure. The bottle may exploed and may lead to serious accident. To avoid this, the bottles are kept under water, As a result, the temperature is likely to decrease and the solubility of the gas is likely to increase in aqueous solution resulting in decreased pressure.
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