AP BIOLOGY

Detailed explanation-1: -The total quantity of dissolved salts in seawater is expressed as salinity, which can be calculated from conductivity and temperature readings. Salinity was historically expressed quantitatively as grams of dissolved salts per kilogram of water (expressed as percentage) or, more commonly, in parts per thousand (ppt).

Detailed explanation-2: -Salinity is the amount of dissolved salts or ions in seawater. The unit of measurement is grams of salt per 1000 grams of seawater or simply parts per thousand (written as ‰).

Detailed explanation-3: -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.