When temperature increases, the oxygen content of the water will decrease.
The sun shining on a tidal pool during a hot day heats the water, causing some water to evaporate. Because the water has become warmer and saltier, the oxygen content decreases.
The temperature and salinity of water influence how much oxygen it can hold.
Warm water holds less dissolved oxygen than cold water because the molecules are moving faster than in cold water and thereby allow oxygen to escape from the water.
Dissolved oxygen level makes the water unfit for the aquatic animals.
The higher the temperature the more oxygen molecules will leave solution as more of the intermolecular forces of attraction will be overcome. The intermolecular attraction occur due to the highly electronegative oxygen atoms of the O2 molecules being attracted to the more positively charged hydrogen atoms of the water molecules.
Also in cold water, the water molecules are closer together, so have less kinetic energy. Thus they are more able to trap packets of oxygen molecules. The maximum amount of O2 dissolved is called the “saturation value”.
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