Because gasses are separated when introduced to the solvent (water), this happens whenever gas molecules are added.
For gases in water, this follows.
Weak intermolecular interactions between gas molecules are constant. Thus, there is a negligible intermolecular force between the molecules of gas and water. The mean kinetic energy of the gas particles in water increases with temperature due to this weak force. By reducing the solubility, it enables the oxygen molecules to withstand the weak intermolecular forces and re-enter the gas phase.
As a result, He gas's solubility rises as temperature falls.
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