A review of measurement techniques for aerosol effective density

Density (rho) is one of the most important physical properties of aerosol particles. Owing to the complex nature of aerosols and the challenges of measuring them, effective density (rho(e)) is generally used as an alternative measure. Various methods have been developed to quantify the rho(e) of aerosols, which provide powerful technical support and understanding of their physical properties. Here, we present a comprehensive review of the characterisation techniques of rho(e) currently used in the literature. Overall, six categories of measurement are identified, and the typical configuration, measurement principles, errors and field applications of each are demonstrated. Their respective advantages and disadvantages are also discussed to improve their application. Finally, we outline future directions for further technical improvement in, and instrumental development for, rho(e) measurement. (C) 2021 Elsevier B.V. All rights reserved.

Automated summary

This paper reviews the characterization techniques of effective density (ρe) of aerosol particles currently used in literature, identifying six categories of measurement methods and discussing their respective advantages and disadvantages, as well as outlining future directions for further technical improvement and instrumental development in ρe measurement.