在标准大气压下,我们认为海水的密度是不变的。但是对于不同海区海水密度有不同的值,这取决于海水中的含盐量,因此海水密度是没有确定值的。波罗的海的盐度最低,海水密度也最小;红海盐度最高,海水密度也最大。在大河出海口处海水盐度甚至接近淡水,密度较小。但也可能因为河水裹挟泥沙的原因使得海水密度增大,还可能由 At standard atmospheric pressure, we believe that the density of seawater is constant. However, the values ​​of seawater density in different sea areas have different values, which depend on the salt content in seawater. Therefore, the density of seawater is not determined. The Baltic Sea has the lowest salinity, and the seawater density is also the smallest; the Red Sea has the highest salinity and the highest seawater density. In the mouth of the river, the salinity of seawater is even closer to that of fresh water, and its density is smaller. However, it is also possible that the density of seawater may be increased by