400 g/kg to PSU

400 g/kg = 401.96 PSU

g/kgPSU
385 g/kg386.886
390 g/kg391.911
395 g/kg396.935
400401.96
405 g/kg406.984
410 g/kg412.009
415 g/kg417.033

400 g/kg = 401.96 PSU

Formula

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