mixing

in analytical chemistry
https://doi.org/10.1351/goldbook.M03945
The combining of components, particles or layers into a more homogeneous state. The mixing may be achieved manually or mechanically by shifting the material with stirrers or pumps or by revolving or shaking the container. The process must not permit
segregation
of particles of different size or properties.
Homogeneity
may be considered to have been achieved in a practical sense when the
sampling error
of the processed portion is negligible compared to the total error of the
measurement
system.
Source:
PAC, 1990, 62, 1193. (Nomenclature for sampling in analytical chemistry (Recommendations 1990)) on page 1204 [Terms] [Paper]