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powder,

any mass of fine particles or dust prepared by various mechanical means, e.g., grinding of solid substances, or by chemical means, e.g., precipitation from solutions. In a special sense, the word is applied to powdered propellant explosives, e.g., gunpowder, and to powdered substances that produce a bright light when ignited. See explosiveexplosive,
substance that undergoes decomposition or combustion with great rapidity, evolving much heat and producing a large volume of gas. The reaction products fill a much greater volume than that occupied by the original material and exert an enormous pressure, which can be
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.

Powder

 

a finely ground solid, a dispersed free-flowing material.

Powder is formed by dispersion of solids and by separation of the solid dispersed phase from supersaturated solutions or vapors. The manufacture of highly dispersed powders usually involves such substances as softening solutions, dispersing agents, and stabilizers. These facilitate pulverizing and prevent the agglutination of fine particles. Particle size in powders may vary from 10-4 to 10-1 mm. Powders with particles of identical size are called monodisperse powders, and those with particles of varying size are known as polydisperse powders. Fine powders, especially hygroscopic types, are subject to lumping and caking. Highly dispersed dry powder carried off by a gas or air flow becomes dust. Powder moistened with a liquid forms a paste or dough, and when powder is rapidly agitated in a sufficiently large volume of liquid, a suspension is produced.

Many types of commercial products are manufactured and used in powder form. They include materials used in metallurgy and silicate technology; mineral binders, fillers, and pigments; ingredients for plastics, rubbers, paints, and explosives; fertilizers and pesticides; detergents; food products; and medications. Products in powder form are often granulated or compressed into tablets to ensure convenience in handling and to reduce loss and improve sanitation.

REFERENCE

Voiutskii, S. S. Kurs kolloidnoi khimii. Moscow, 1964. Page 374.

L. A. SHITS


Powder

 

a friable solid form of medicine used internally or externally. Various synthetic preparations, antibiotics, and substances of plant and animal origin are used in powder form. The following substances are not prescribed as a powder: hygroscopic substances, such as calcium chloride and sodium bromide; mixtures of substances that are fluidized upon exposure to the air, such as phenylsalicylate and bromo-camphor or antipyrine and quinine; substances that easily decompose, such as silver nitrate mixed with organic matter; or substances that form explosive mixtures. Powders may be simple (consisting of a single substance) or compound; they can be divided or not divided into individual doses.

powder

[′pau̇d·ər]
(materials)
A general term for explosives.
A loose grouping or aggregation of solid particles, usually smaller than 1000 micrometers.

powder

1. a solid substance in the form of tiny loose particles
2. any of various preparations in this form, such as gunpowder, face powder, or soap powder
3. fresh loose snow, esp when considered as skiing terrain
References in periodicals archive ?
The sources said current estimated production of powdered milk is around 67,000 tons annually in the country.
She added that the health agency shall implement the gradual switching to powder-free gloves and eventually phase out powdered gloves, and shall be completed by the end of 2018.
This graph illustrates that the powdered milk has a fill density of about 335 kg/[m.sup.3] and rises to about 385 kg/m3 at around 4.5 kPa of consolidating stress.
Because the ratio of surface area to volume soars when materials are powdered, surface vibrations absent in the bulk metal become abundant in the powder, the Bayreuth researchers suggest.
The proposed ban would apply to all powdered gloves except powdered radiographic protection gloves.
For the sherbet: In a medium saucepan bring water, glucose, powdered milk, orange zest, stabilizer and sugar to a boil.
Powdered tungsten and molybdenum disulfides already work so well that "to beat them is really hard."
Even though raw material producers and equipment suppliers put considerable effort into the development of powdered rubber technology, no major breakthrough was achieved.
Food and Drug Administration (FDA) published a Federal Register notice proposing to ban powdered surgeons gloves, powdered patient evaluation gloves and absorbable powder for lubricating surgeons gloves.
Mixtures containing a finely powdered additive or materials that give off a flammable vapor should be avoided.
Request Free Sample Report @ https://www.mrrse.com/sample/18345 Powder metallurgy is used to process powdered feedstock to manufacture various types of components across several industries globally.