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