90.5 g/kg to PSU

90.5 g/kg = 90.943 PSU

g/kgPSU
75.5 g/kg75.87
80.5 g/kg80.894
85.5 g/kg85.919
90.590.943
95.5 g/kg95.968
100.5 g/kg100.992
105.5 g/kg106.017

90.5 g/kg = 90.943 PSU

Formula

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