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. Author manuscript; available in PMC: 2015 Dec 30.
Published in final edited form as: Aerosol Sci Technol. 2015;49(9):816–827. doi: 10.1080/02786826.2015.1076156

Figure 1.

Figure 1

Diagram of the fast-flow tube setup, where FA was the flow rate of either zero air or a puff of smoke delivered at 1.30 L/min; fA, fB, and fC were the volume fractions of a VOC in each region; Rm was the rate (μg/s) of a VOC entering the flow tube; Cx was the initial concentration (molecules/cm3) of a VOC in the flow tube; F1=F2 were dilution flows of zero air (e-cigarette: 5 L/min, cigarette: 10 L/min); and ΔP (e-cigarette: 52 torr, cigarette: 2.8 torr) was the pressure difference between sections B and C separated by a 1.25 mm orifice; the pressure difference was precisely set with a valve in section B.