Seawater has different features such notable differences in color, density, temperature, and salinity, unlike inland waters.
The main physical properties of the seawater are:
The color of the seawater is usually blue; by reflection of the atmosphere’s color, however, varies by salinity, depth, and daylight hours.
It usually has a higher density than fresh water due to dissolved substances in it, i.e. salinity.
The temperature varies with latitude, depth, seasons and other factors.
Among the chemical properties that oceans and seas have, the most important is salinity, which is "the total number of grams of solid substances contained in a liter of seawater" (Salinas, 2012). The salinity of seawater varies greatly on the geographic location and solar radiation.