The size of the particles is called the particle size of the particles, which may also be referred to as particle size. Particle size or particle size refers to particle diameter. Of course, for non-spherical particles, the particle size is related to the measurement criteria and statistical methods, and the particle size can only be "equivalent".

The percentage (or cumulative percentage) of particles with different particle size intervals in the total powder is called frequency particle size distribution (or cumulative particle size distribution). Percentage or cumulative percentage, the abscissa is the particle size value calculated for different benchmarks. D10, D50, D90 can reflect the uniformity of the powder, which is also called the cumulative distribution of the powder.

D50: Also known as the median particle size, it refers to the particle size value corresponding to the cumulative distribution percentage reaching 50%. This is a typical value for particle size that accurately divides the population into two equal parts, meaning that 50% of the particles are above this value and 50% below this value. If the D50 of a sample is 5 μm, it means that among all the particles of particle size that make up the sample, the particles with a particle size larger than 5 μm account for 50%, and the particles smaller than 5 μm also account for 50%. D50 is often used to represent the average particle size of powders.

D97: refers to the particle size value corresponding to when the cumulative distribution percentage from small to large reaches 97% in the particle size distribution. That is to say, in a certain powder, the number of particles with a particle size smaller than D97 accounts for 97% of the total number of particles. It is usually used to represent the coarse end particle size index of powder, and it is a key indicator in powder production and application. Similarly, some industries use D90, D95, D98 and other values, and their physical meanings are similar to D97.

D10: It means that the cumulative percentage below this value is 90% above 10%, and D90 is just the opposite.