668 g/kg to PSU

668 g/kg = 671.273 PSU

g/kgPSU
653 g/kg656.2
658 g/kg661.224
663 g/kg666.249
668671.273
673 g/kg676.298
678 g/kg681.322
683 g/kg686.347

668 g/kg = 671.273 PSU

Formula

1 g/kg ≈ 1.0049 PSU · 1 mg/L ≈ 0.001 PSU · 1 ppm ≈ 0.001 PSU (dilute aqueous approximation)