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Table 1 Loss Coefficients (k) and Equivalent Linear Resistances (R) for the Rp5, Rp20, and Rp50 Parabolic Resistors

From: Bench and mathematical modeling of the effects of breathing a helium/oxygen mixture on expiratory time constants in the presence of heterogeneous airway obstructions

    R[cmH 2OI -1 s]
Resistor k Q[I/min] Air He/O 2
Rp5 3.3 20 0.9 0.3
   60 2.7 0.9
Rp20 21.5 20 5.8 2.0
   60 17.5 6.1
Rp50 132.9 20 36.1 12.7
   60 108.4 38.0