Water drops on the hydrophobic surface of grass. In chemistry, hydrophobicity is the physical property of a molecule (known as a hydrophobe) that is seemingly repelled from a mass of water. (Strictly speaking, there is no repulsive force involved; it is an absence of attraction.) In contrast, hydrophiles are attracted to water.
Ocean salinity is generally defined as the salt concentration (e.g., Sodium and Chlorure) in sea water. It is measured in unit of PSU (Practical Salinity Unit), which is a unit based on the properties of sea water conductivity. It is equivalent to per thousand or (o / 00) or to g/kg.
8. These days salinity is measured by measuring the electrical conductivity of a seawater sample. The conductivity is directly proportional to the content of dissolved salts and can be, therefore, parlayed into a salinity determination. 9. When seawater evaporates or is diluted by precipitation, only the proportion of H2O changes so the proportions of these salts are unchanged.