The two most abundant gases in the air are N2 and O2, both non-polar gases. Such non-polar molecules with very low solubility must exist in the gaps between water molecules, so gap filling is a way for air to dissolve in water. In addition, we know that as the temperature increases, the amount of gas dissolved in water decreases, so it is also believed that there is a chemical reaction between water molecules and gas molecules called hydration.
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