Salinity

Tank Volume | Alkalinity (KH) | Salinity | Temperature

Salinity Conversion Table relative to Temperature

Conversion table for salinity in parts per thousand (ppt) to specific gravity (sg) combined with temperature variation.



    
      
    

      Approximate salinity, in parts per thousand, for the hydrometer reading at the indicated temperature.
    

      Temperature
      Specific Gravity
    

      Fahrenheit
      Celsius
      1.020
      1.021
      1.022
      1.023
      1.024
      1.025
      1.026
      1.027
        
        

            74.0
            23.3
            28.0
            29.3
            30.6
            31.9
            33.3
            34.6
            35.9
            37.2
          

            75.0
            23.9
            28.2
            29.5
            30.8
            32.1
            33.5
            34.8
            36.1
            37.4
          

            76.0
            24.4
            28.4
            29.7
            31.0
            32.3
            33.7
            35.0
            36.3
            37.6
          

            77.0
            25.0
            28.6
            29.9
            31.2
            32.5
            33.9
            35.2
            36.5
            37.8
          

            78.0
            25.6
            28.8
            30.1
            31.4
            32.7
            34.1
            35.4
            36.7
            38.0
          

            79.0
            26.1
            29.0
            30.3
            31.6
            32.9
            34.3
            35.6
            36.9
            38.2
          

            80.0
            26.7
            29.2
            30.5
            31.8
            33.2
            34.5
            35.8
            37.1
            38.5
          

            81.0
            27.2
            29.4
            30.7
            32.0
            33.4
            34.7
            36.0
            37.4
            38.7
          

            82.0
            27.8
            29.6
            30.9
            32.3
            33.6
            34.9
            36.3
            37.6
            38.9
          

            83.0
            28.3
            29.8
            31.2
            32.5
            33.8
            35.2
            36.5
            37.8
            39.2
          

            84.0
            28.9
            30.1
            31.4
            32.7
            34.1
            35.4
            36.7
            38.1
            39.4
          

            85.0
            29.4
            30.3
            31.6
            33.0
            34.3
            35.6
            36.9
            38.3
            39.6
          

            86.0
            30.0
            30.5
            31.8
            33.2
            34.5
            35.8
            37.2
            38.5
            39.8
          

            87.0
            30.6
            30.8
            32.1
            33.4
            34.8
            36.1
            37.4
            38.8
            40.1
          

  

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The direct calculation from Salinity (‰ - ppt) to Density (g/l or kg/m3) / Specific Gravity is based on the equation adopted by UNESCO - The One Atmosphere International Equation of the State of Seawater (Millero and Poisson, 1981).

The inverse calculation, from Specific Density / Gravity to Salinity, is performed by the solution for iterative methods of the reverse equation of Millero and Poisson.
The calculation from Conductivity to Salinity / Density / Gravity Specification is performed according to the complex polynomial equation adopted by UNESCO/ICES/SCOR/IAPSO. In this case, the values are reliable for the resulting salinity between 2 and 42 and a temperature between -2 °C and 35 °C.
The Conductivity calculation is performed through the solution for iterative methods of the reverse equation adopted by UNESCO/ICES/SCOR/IAPSO.
Salinity values are expressed in "Practical Salinity" (?)

Thanks to OceanLife for providing the source code for the calculations.
Thanks to CaptiveReefs for providing the source code for the salinity table.