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.
The molality of a solution is the moles of solute dissolved in 1 kilogram (1000g) of solvent (often water). The symbol for molality is lower case âmâ. Thus a 3.0 molal solution of nitric acid, abbreviated 3.0 m HNO3, contains 3.0 moles of HNO3 in 1 kg of water.olarity (M), molality (m) and the Colligative properties. The molarity of a solution is the number of moles of solute per liter of solution.