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Measurement of physical and chemical properties of collected aerosols at the power range from 20 to 80 W. (a) Generated aerosol mass per puff, (b) nicotine mass per puff, (c) viscosity of e-liquid and collected aerosols, and (d) pH values of e-liquid and collected aerosols. In (c,d), *: p-value <0.05, **: p-value <0.01.
