Dictionary, Defintion, Meaning, What is Dulong Petits Law, Dysprosium, Dry Ice, Dry Cleaning, Down Process, Drier, Duplet, Dyestuffs, Dynamite, Dystetic Mixture

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Home >> Chemistry Dictionary >>Dulong Petit's Law - Dysprosium

Your Ad Here	Dry cleaning. The process of cleaning fabrics using solvents which dissolve dirt at low temperatures but do not swell fibres. The most widely used cleaning fluids are the highly inflammable hydrocarbons and chlorinated hydrocarbon, particularly C₂C_l4 Dry ice. Solid carbon dioxide used as a refrigerant. It is so called because it sublimes at ¾ 78C (195 k) at standard pressure rather than melting. Dry point. In a laboratory distillation the thermometer reading observed when the last drop of liquid evaporates from the lowest point in the flask.
Dulong Petit’s Law. The product of the atomic weight and the specific heat of a metal in the solid state in approximately equal to 6.2 Atomic weight = 6.4/Specific heat But Atomic weight = Equivalent weight x Valency Or Valency = Atomic weight/ Equivalent weight Accurate atomic weight = Equivalent weight x Valency Duplet. Refers to a pair of electrons in a covalent chemical bond.
Duralumin. An alloy of aluminium containing magnesium 0.5% manganese 0.5% copper 4% and aluminium 95%. It is used in making air-ships. Dyestuffs. Intensely coloured compounds applied to a substrate. E.g. fibre, paper, cosmetic, hair, to give colour. React by absorption, solution, bonding. Pigments retain their identity more closely on bonding to the substrate. Colours generally originate in electronic transitions; most dyestuffs are organic in nature but are frequently applied together with inorganic species. Classified in the colours index by chemical nature; also classified by their method of application as acid, basic, direct, disperse, disperse, azo, sulphur, vat or fibre reactive. Dy. Dysprosium. Dystectic mixture. A mixture of substances having a constant maximum melting point.	Your Ad Here
Dynamite. A mixture of nitroglycerine with other substances to make the explosive safer to handle and to have specific explosive properties. The original form invented in 1867 by Alfred Nobal consisted of nitroglycerine absorbed in kieselguhr, modern dynamites, which are used for blasting contain sodium or ammonium nitrate sensitized with nitroglycerin and use other absorbers (wood pulp). Dysprosium. Dy. At. no. 66, wt. 162.50, m.p. 1409°C, b.p. 2335°C, d 8.5. A lanthanide. The metal is hep. A Dy metal foil is used to measure neutron fluxes. Dy compounds are used in lasers and phosphorus.

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