690 g/kg to PSU

690 g/kg = 693.381 PSU

g/kgPSU
675 g/kg678.307
680 g/kg683.332
685 g/kg688.356
690693.381
695 g/kg698.405
700 g/kg703.43
705 g/kg708.454

690 g/kg = 693.381 PSU

Formula

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