664 g/kg to PSU

664 g/kg = 667.254 PSU

g/kgPSU
649 g/kg652.18
654 g/kg657.205
659 g/kg662.229
664667.254
669 g/kg672.278
674 g/kg677.303
679 g/kg682.327

664 g/kg = 667.254 PSU

Formula

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