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23. What is equivalent particle diameter
  The equivalent particle diameter is divided into the following meanings:

-Equivalent projected area diameter
Diameter of a circle having the same area as the particle's projection

-Equivalent surface area diameter
Diameter of a a sphere having the same surface area as the particle

-Equivalent volume diameter
Diameter of a sphere having the same volume as the particle

-Equivalent sieve (near-mesh) diameter
Diameter of particles that just pass through the apertures of a sieving medium (near-mesh diameter, sometimes calibrated or normimal aperture size of sieve)

-Stokes diameter
Diameter of a sphere having the same settling rate as the particle under conditions of Stokes's law

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