What is Equivalent Particle Diameter

  • The equivalent particle diameter is divided into the following meanings:
  • Equivalent spherical diameter
  • In science, the equivalent spherical diameter (or ESD) of an irregularly shaped object is the diameter of a sphere of equivalent volume.
  • Equivalent projected area diameter
  • - Diameter of a circle having the same area as the particle's projection
  • HMK-CD7 Image and Shape Particle Size Analyzer
  • Equivalent surface area diameter
  • - Diameter of a a sphere having the same surface area as the particle
  • HMK-22 Fisher Sub-Sieve Sizer

  • Equivalent volume diameter
  • - Diameter of a sphere having the same volume as the particle
  • AS-2011 Laser Particle Size Analyzer
  • 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 Equivalent volume diameter is most frequently used during particle sizing.
  • AS-2012 Submicron Laser Particle Size Analyzer