A powder is a dry, bulk solid composed of many very fine particles that may flow freely when shaken or tilted. Powders are a special sub-class of granular materials , although the terms powder and granular are sometimes used to distinguish separate classes of material. In particular, powders refer to those granular materials that have the finer grain sizes, and that therefore have a greater tendency to form clumps when flowing. Granulars refers to the coarser granular materials that do not tend to form clumps except when wet. Many manufactured goods come in powder form, such as flour , sugar , ground coffee , powdered milk , copy machine toner , gunpowder , cosmetic powders, and some pharmaceuticals. In nature, dust , fine sand and snow , volcanic ash , and the top layer of the lunar regolith are also examples. Because of their importance to industry, medicine and earth science, powders have been studied in great detail by chemical engineers , mechanical engineers , chemists , physicists , geologists , and researchers in other disciplines.
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Other versions are coated in marzipan, or dusted in powder sugar. This powder can be shipped anywhere and then reconstituted—just add water, as if it were instant coffee. They say that the Israelis framed him in order to light the powder keg of religious war over the al-Aqsa compound. Inside the wax floored examining room, I sat up on the powder blue table with my shirt off. Even Congress passed a law reducing the disparity between crack and powder cocaine sentences.
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