How does particle shape affect distribution?
• Particle size: For spherical particles particle size is the diameter of the particle. Real particles in the air often have complicated shapes. For non-spherical particles, the term “diameter” does not strictly applicable. For example, a flake or a fibre has different dimensions in different directions. Particles of identical shape can be composed of different chemical substances and have different densities. The differences in shape and density cause considerable confusion in defining particle size. • Aerodynamic diameter: The term “aerodynamic diameter” has been introduced in order to provide a single parameter of describing real non-spherical particles having of arbitrary shapes and densities. The aerodynamic diameter is the diameter of a spherical particle having a density of 1 g/cm3 that has the same inertial property (terminal settling velocity) in the air (at standard temperature and pressure) as the particle of interest. Inertial sampling instruments like cascade impactors ena
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