part per billion by volume (moisture)
One part per billion by volume of moisture is 0.621945 × 10⁻⁹ kg/kg on the same dilute linearisation as ppmv. Ultra-high-purity gases for semiconductor fabrication are specified in ppbv, where single-digit values are routine and the linearisation is essentially exact.
Watch out: At these levels the reading is dominated by outgassing from the delivery system. A ppbv specification refers to the gas at the cylinder, and the moisture at the tool depends on the tubing, the fittings and how long the line has been purged.
| 1 | 6.2194500e-07 |
One part per billion by volume (moisture) in every humidity ratio unit
| 1 | part per billion by volume (moisture) (ppbv)this unit | |
| 0.621945 | microgram per kilogram of dry air (μg/kg) | |
| 0.001 | part per million by volume (moisture) (ppmv) | |
| 0.000621945 | milligram per kilogram of dry air (mg/kg) | |
| 0.00000435361 | grain per pound of dry air (gr/lb) | |
| 6.21945e-07 | gram per kilogram (g/kg) | |
| 6.21945e-10 | kilogram per kilogram (kg/kg) | |
| 6.21945e-10 | pound per pound of dry air (lb/lb) |
Solvers that use humidity ratio