Answer: The density of water can also be affected by temperature. ... The warmer the water, the more space it takes up, and the lower its density. When comparing two samples of water with the same salinity, or mass, the water sample with the higher temperature will have a greater volume, and it will therefore be less dense. Temperature is also important because of its influence on water chemistry. The rate of chemical reactions generally increases at higher temperature. ... Warm water holds less dissolved oxygen than cool water, and may not contain enough dissolved oxygen for the survival of different species of aquatic life.
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