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.
Resistivity of pure water (in MÏ-cm) as a function of temperature. The SI unit of conductivity is S /m and, unless otherwise qualified, it refers to 25 Â°C. Often encountered in industry is the traditional unit of Î¼S/cm. 10 6 Î¼S/cm = 10 3 mS/cm = 1 S/cm.