powder are evaluated by 1) particle size shape 2) flow properties 3) density 4) all of the above
Answers
1. The particle size of a spherical object can be unambiguously and quantitatively defined by its diameter. However, a typical material object is likely to be irregular in shape and non-spherical. The above quantitative definition of particle size cannot be applied to non-spherical particles.
2. The flow properties of powders and bulk solids depend on several parameters, e.g., particle size distribution, moisture, temperature. Often flow properties vary with stress level. ... Besides flow properties, in specific situations other effects may be of interest, e.g., attrition of particles when flowing in a silo.
3. Density is a measure of mass per volume. The average density of an object equals its total mass divided by its total volume. An object made from a comparatively dense material (such as iron) will have less volume than an object of equal mass made from some less dense substance (such as water).
4. This idiom can be used to mean everything that has been said or written, especially all the choices or possibilities.