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For an updated and comprehensive look at DO and the technology used to measure it, check out: Dissolved Oxygen, or Measuring Dissolved Oxygen. Dissolved oxygen in water is vital for underwater life. It is what aquatic creatures need to breathe. Dissolved oxygen is often called DO for short.
The maximum amount of dissolved oxygen a body of water can hold (saturated solution) depends on several factors. Dissolved oxygen solubility is affected by water temperature, atmospheric pressure and salinity. Cold water can dissolve more oxygen than warm water. As the temperature goes up, water releases some of its oxygen into the air.