What determines the salinity of ocean waters?

In the sea and ocean water there is salt, such as we are used to seeing it at home, only dissolved. So, the salinity of water depends on how many grams of salt per liter of water, it is also called ppm. The salinity coefficient of water depends on the fact that the water evaporates and the salt remains. The warmer the water, the more salt it contains and vice versa. The least salty water is near the poles, because there ice melts and fresh water enters the ocean, thereby reducing its salinity.