Thus from the total mass (MT) of the particle sample and its total surface area (>ST) (which can be determined experimentally), the surface mean diameter of the particles can be calculated if their density (p) is known.

An advantage of applying the log-normal distribution to atmospheric aerosols is that the value of the geometric standard deviation, <rg, is the same for a given sample for all types of distributions—count, mass, surface, and volume, ft is only the value of the geometric mean diameter that changes, depending on the

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