This is gases that can no longer stay dissolved at higher temperature. Salinity Effects on Solubility Freshwater can hold more oxygen than saltwater. The dissolved salt forces dissolved gas out of water thereby lowering the solubility of water. So a known relationship between salinity and dissolved oxygen concentration allows for a correction for salinity. See Appendix 1 for this correction table.
Water is necessary to all life on earth.
So it is very important to maintain the quality of water. Most aquatic life depends upon oxygen dissolved in water for respiration, just as we breathe oxygen in the atmosphere containing oxygen. The quality of water in lakes and streams is rated according to what species of fish the water will support. Think of an aquarium. Also temperature is important.