Figure 6From: Bench and mathematical modeling of the effects of breathing a helium/oxygen mixture on expiratory time constants in the presence of heterogeneous airway obstructions The pressure drop across the flow sensor, and across the total expiratory circuit (including the flow sensor), plotted against the flow rate of a) air and b) He/O 2 78/22. For comparison, the pressure-flow relationships for Rp5, Rp20, and Rp50 resistors are also shown.Back to article page