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.
Most commonly, a special type of conductivity, called specific conductivity, is used. Conductivity Technology. Conductivity and salinity are both measured by an electric probe on the data logger. This probe measures how much electrical current moves through the water. Salinity is then calculated from this value. Conductivity is determined by measuring how easily an electrical current flows between two metal plates.