| D | Physical diameter of particles (m) |
| ED | Emitted dose (g) |
| ffc | Flow function coefficient (flow index) (−) |
| FPD | Fine particle dose (g) |
| FPF | Fine particle fraction (%) |
| HR | Hausner ratio (−) |
| k | Unconsolidated powder permeability (m4/Ns) |
| MMAD | Mass median aerodynamic diameter of particles (m) |
| NGI | Next generation impactor |
| ΔP | Pressure drop (N/m2) |
| RH | Relative humidity (%) |
| SS | Salbutamol sulfate |
| TS | Terbutaline sulfate |
| ρb | Unconsolidated powder bulk density (kg/m3) |
| ρp | Particle gas pycnometry density (kg/m3) |
| τ0 | Cohesion strength (N/m2) |
| φ | Angle of internal friction (o) |
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