milligram per kilogram of dry air
Humidity ratioexact by definition
The milligram per kilogram of dry air is 10⁻⁶ kg/kg, which is one part per million by mass. It is the unit for desiccant-dried and compressed air, where the humidity ratio is far too small for the g/kg of a psychrometric chart: instrument air at a −40 °C dew point holds about 80 mg/kg.
| 1 | 0.001 |
One milligram per kilogram of dry air in every humidity ratio unit
| 1,607.86 | part per billion by volume (moisture) (ppbv) | |
| 1,000 | microgram per kilogram of dry air (μg/kg) | |
| 1.60786 | part per million by volume (moisture) (ppmv) | |
| 1 | milligram per kilogram of dry air (mg/kg)this unit | |
| 0.007 | grain per pound of dry air (gr/lb) | |
| 0.001 | gram per kilogram (g/kg) | |
| 0.000001 | kilogram per kilogram (kg/kg) | |
| 0.000001 | pound per pound of dry air (lb/lb) |
Solvers that use humidity ratio