Martin Desruisseaux created SIS-413:

             Summary: Units.PSU should have a scale value of 1/1000
                 Key: SIS-413
             Project: Spatial Information Systems
          Issue Type: New Feature
          Components: Utilities
    Affects Versions: 0.8
            Reporter: Martin Desruisseaux
            Assignee: Martin Desruisseaux
             Fix For: 1.0

Sea Water Salinity was used to be measured in g/kg, with values sometime 
written with the "‰" symbol (e.g. "35‰"). In modern oceanography, this has been 
replaced by _Practical Salinity Unit_ (PSU), with values written without symbol 
(e.g. "35"). Strictly speaking, PSU units are not convertible to g/kg. However 
the PSU scale is by design very close to the old scale. If someone nevertheless 
attempts a conversion between those two scales, we want it to be close to the 
identity operation. Currently, the conversion wrongly multiply or divide values 
by 1000.

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