660 g/kg to PSU

660 g/kg = 663.234 PSU

g/kgPSU
645 g/kg648.16
650 g/kg653.185
655 g/kg658.209
660663.234
665 g/kg668.258
670 g/kg673.283
675 g/kg678.307

660 g/kg = 663.234 PSU

Formula

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