PSU or psu 1
PSU or psu 1 :
An abbreviation for practical salinity unit, a standard measure of the salinity of seawater. The "unit" is actually a dimensionless (unitless) ratio obtained by measuring the conductivity of the water sample. Seawater of salinity 35 PSU has the same conductivity as a standard solution of potassium chloride (KCl) with a concentration of 3.243 56 % by mass; a sample of salinity 1 PSU would have conductivity 1/35 that of the standard solution. With this definition, measurements in PSU are very nearly the same as direct measurements of salt ion concentration in parts per thousand
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