micromole per kilogram
Molalityexact by definition
The micromole per kilogram is 10⁻⁶ mol/kg. Chemical oceanography runs on it: dissolved oxygen, nitrate, phosphate and dissolved inorganic carbon in seawater are all reported in μmol/kg, because a per-kilogram basis does not change as a sample warms on its way up from depth.
| 1 | 0.000001 |
Where the unit came from
The switch from per-litre to per-kilogram in oceanography was deliberate. Seawater density varies by several percent across the ocean's temperature and salinity range, so a per-volume concentration measured on deck is not the concentration that was at 2000 m. Per kilogram, it is.
One micromole per kilogram in every molality unit
| 1,000 | nanomole per kilogram (nmol/kg) | |
| 1 | micromole per kilogram (μmol/kg)this unit | |
| 0.001 | millimole per kilogram (mmol/kg) | |
| 0.0001 | centimole per kilogram (cmol/kg) | |
| 0.0001 | milliequivalent per 100 grams (meq/100 g) | |
| 0.000001 | mole per kilogram (molal) (mol/kg) | |
| 0.000001 | millimole per gram (mmol/g) | |
| 0.000001 | milliequivalent per gram (meq/g) |
Solvers that use molality