Answer:
In aerated water bottles, \[C{{O}_{2}}\]
gas is passed through the aqueous solution 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
decreases 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
becomes too high, then glass will not be able to withstand the pressure. The bottle
may explode 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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