Explanation
powder body is called powder for short, which is an aggregate composed of a large number of particles and spaces between particles. The substances in nature can be divided into solid, liquid and gas states according to their physical states, while homomorphic substances can be divided into three categories according to the degree of dispersion: dense body, powder body and colloid, that is, those with a size of more than 1mm are called dense body or commonly referred to as solid, 0.1 μ Those below m are called colloids, while those between the two are called powders.
Classification
No classification at present.