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.
Ocean salinity (expressed in-per mil) is approximately equal to the weight, in grams, of salts dissolved in 1000g of seawater. This would be the salt concentration in parts-per-thousand (). Average ocean water has a salinity of 35g of dissolved salts.Expressed in %, it would be 96.5% pure water molecules and 3.5% of salts, dissolved gases, organic materials and undissolved particles. This means that 1000g of average seawater contains 965 grams of water and 35 grams of salts.n case of a saline solution (seawater included), it means that an Isotonic solution is 9 (that's NOT 9% - that's PARTS PER THOUSAND) salt and 991 purified water. In a roundabout way, one might say that Isotonic seawater has only 1/3 the salt content of regular ocean water (not the Dead Sea!).