Definition of Particle Size in Particle Size Analyzer

When the physical property or physical behavior of the measured particle is most similar to a homogeneous sphere (or a combination thereof) of a certain diameter, the diameter (or a combination thereof) of the sphere is used as the equivalent particle size of the measured particle ( Or particle size distribution).

Its meaning:

1. The particle size measurement is essentially obtained by comparing the measured particle with a sphere made of the same material;

2. Different principle instruments choose different physical characteristics or physical behaviors as reference values ​​for comparison. For example, the sedimentation speed is selected by the sedimentation instrument, the scattered light energy distribution is selected by the laser particle size analyzer, and the sieve particles are used to pass the sieve pores;

3. When comparing the physical properties or physical behavior of the particle to be measured with a homogeneous sphere, sometimes one (or a group) of spheres with exactly the same characteristics (such as a Coulter counter) can be found, and sometimes only Can find the closest sphere (such as laser particle size analyzer). Since "the same" can be used as a special case of "approximation" in theory, the use of "similar" in the definition makes the definition more general;

4. When comparing the physical properties or physical behavior of the particle to be measured with that of a homogeneous sphere, sometimes a ball with a certain diameter can be found corresponding to it, sometimes a combination of balls of different sizes is required to correspond to it. Can be the closest (for example, laser particle size analyzer)