Answer:
Salinity is the measure of the number of grams of salts per kilogram of seawater, which is expressed in parts per thousand. Parts per thousand can be defined as how many parts, or grams, of salt there are per thousand parts, or kilogram (1,000 g), of seawater. The symbol for parts per thousand is ‰. The symbol for parts per thousand (‰) is similar to the symbol for percent (%), which is parts per hundred, but with an extra zero in the denominator. Parts per thousand is commonly abbreviated as ppt.
