I have read that boiling and stirring should degas the water, but does it dissolve again upon cooling?
Well,
Certainly, the gases are soluble in water again for as long as there is any degree of contact. The degree of solubility depends on the surrounding conditions.
Degas in condition of isolation with air.
Sincerely
Reduce the pressure in the fluid and the dissolved gases will be removed from it.
When a certain limit is reached, cavitation begins, which leads to the complete degassing of the fluid.
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