efflorescence definition chemistry
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Efflorescence Secondary efflorescence on the dam of the Robert Moses Niagara Power Plant. In chemistry, efflorescence (which means to flower out in French) is the migration of a salt to the surface of a porous material, where it forms a coating. The essential process comprises the dissolving of an internally-held salt in water, or occasionally in another solvent. The water, with the salt now held in solution, migrates to the surface, then evaporates, leaving a coating of the salt.
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Color of chemicals The color of chemicals is a physical property of chemicals that in most cases comes from the excitation of electrons due to an absorption of energy performed by the chemical. What is seen by the eye is not the color absorbed, but the complementary color from the removal of the absorbed wavelengths.
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- The problem of efflorescence, or the deposit of water-soluble salts on the surfaces of masonry, stucco or concrete, is an old one, and one that has been studied and reported on as early as 1877.
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Efflorescence and Masonry Efflorescence is a crystalline deposit of water-soluble salts (usually white) on the surface of masonry. All masonry materials are susceptible to efflorescence.In a chemical analysis, water-soluble salts consisting of only a few tenths of one percent is sufficient to cause efflorescence on a masonry surface.The amount and character of salts of the deposits can vary widely, depending the nature of the soluble materials and the atmospheric conditions.n a chemical analysis, water-soluble salts consisting of only a few tenths of one percent is sufficient to cause efflorescence on a masonry surface. The amount and character of salts of the deposits can vary widely, depending the nature of the soluble materials and the atmospheric conditions.
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Color of chemicals The color of chemicals is a physical property of chemicals that in most cases comes from the excitation of electrons due to an absorption of energy performed by the chemical. What is seen by the eye is not the color absorbed, but the complementary color from the removal of the absorbed wavelengths. This spectral perspective was first noted in atomic spectroscopy. The study of chemical structure by means of energy absorption and release is generally referred to as spectroscopy.
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- Fused pinkish mass, or clear colourless soluble crystals, used in chemistry as a reagent, and deoxidiser. Treat a sample of the flour in a test tube with this reagent. This reagent is composed of three parts of pure nitric acid at 40 with one part of distilled water. If this is not the case a slight excess of the reagent is added. In chemistry, as a reagent; and, owing to the cold produced during its solution, to form frigorific mixtures. This reagent is usually added to the sol, after evaporation and before gelation.
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Sweating Slab Syndrome and Efflorescence Efflorescence is a crystalline deposit of water-soluble salts left on the surface of masonry and concrete as the water evaporates. Efflorescence is a partner of Sweating Slab Syndrome. This article is intended to address only efflorescence in concrete floors and more specifically, secondary efflorescence.
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Definition of 'effervescent tablet' Effervescent tablets break down quickly when they are dropped into water or another liquid. Effervescent tablets are uncoated tablets containing substances that react in the presence of water and give off carbon dioxide. Dissolve two effervescent tablets in water to form a carbonated liquid. Effervescent tablets break down quickly when they are dropped into water or another liquid. tablet
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Coprecipitation In chemistry, coprecipitation (CPT) or co-precipitation is the carrying down by a precipitate of substances normally soluble under the conditions employed. Analogously, in medicine, coprecipitation is specifically the precipitation of an unbound antigen along with an antigen-antibody complex.
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Thermal Diffusivity Thermal Diffusivity. a physical parameter of a substance that characterizes the rate of change of its temperature in transient thermal processes. Thermal diffusivity is a measure of the thermal-inertia properties of a substance. It is numerically equal to the ratio of the substance’s thermal conductivity and the product of its specific heat (at constant pressure) and density. Thermal diffusivity is expressed in m 2 /sec.
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luminescence The emission of light that does not derive energy from the temperature of the emitting body, as in phosphorescence, fluorescence, and bioluminescence. Luminescence is caused by chemical, biochemical, or crystallographic changes, the motions of subatomic particles, or radiation-induced excitation of an atomic system.
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efflorescences  (crystallization) Efflorescence. the loss of water of crystallization from a hydrated or solvated salt to the atmosphere on exposure to air. Efflorescences can occur in natural and built environments. On porous construction materials it may present a cosmetic problem only, but can ...
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White Mold vs Efflorescence How Can You Tell if You Have White Mold or Efflorescence? First, look at the type of material on which you see the white substance. If you see it on anything other than concrete or masonry, it’s mold. Second, spray the substance with a little water in a spray bottle and simply wipe it with a rag.
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- diffusion coefficient. n. 1. (General Physics) the rate at which a diffusing substance is transported between opposite faces of a unit cube of a system when there is unit concentration difference between them.Symbol: D Also called: diffusivity.iffusion coefficient. n. 1. (General Physics) the rate at which a diffusing substance is transported between opposite faces of a unit cube of a system when there is unit concentration difference between them. Symbol: D Also called: diffusivity.
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Chemical Reaction Definition and Examples By Anne Marie Helmenstine, Ph.D. Definition: A chemical reaction is a chemical change which forms new substances. Also Known As: reaction, chemical change. Examples: The chemical reaction H 2 (g) + ½ O 2 (g) → H 2 O(l) describes the formation of water from its elements.y Anne Marie Helmenstine, Ph.D. Definition: A chemical reaction is a chemical change which forms new substances. Also Known As: reaction, chemical change. Examples: The chemical reaction H 2 (g) + ½ O 2 (g) → H 2 O(l) describes the formation of water from its elements.
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Emission spectrum The emission spectrum of a chemical element or chemical compound is the spectrum of frequencies of electromagnetic radiation emitted due to an atom or molecule making a transition from a high energy state to a lower energy state.
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effusion Medical Definition of effusion. 1a: the escape of a fluid from anatomical vessels by rupture or exudationb: the flow of a gas through an aperture whose diameter is small as compared with the distance between the molecules of the gas.
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Coprecipitation From Wikipedia, the free encyclopedia. In chemistry, coprecipitation (CPT) or co-precipitation is the carrying down by a precipitate of substances normally soluble under the conditions employed. Analogously, in medicine, coprecipitation is specifically the precipitation of an unbound antigen along with an antigen-antibody complex. Coprecipitation is an important issue in chemical analysis, where it is often undesirable, but in some cases it can be exploited.
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Effusion Definition, Types, Causes, Symptoms, Treatment Effusion Definition. Effusion is the term for accumulation of fluid in a body cavity particularly within the cranial cavity, in the middle ear, around the lungs, around the heart, in the abdomen (peritoneal cavity) and in the joint spaces. It is also referred to as fluid retention or water retention because most of the fluid is composed of water.
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Incandescence Incandescence usually refers specifically to visible light, while thermal radiation refers also to infrared or any other electromagnetic radiation. For a detailed discussion of the intensity and spectrum (color) of incandescence, see the article: thermal radiation.ncandescence is the emission of electromagnetic radiation (including visible light) from a hot body as a result of its temperature.
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- Most commonly, these are generic drugs. 2 - This drug is available at a middle level co-pay. Most commonly, these are preferred (on formulary) brand drugs. For this standard benefit design, drugs at this level are frequently considered to have a lowest branded copay (LBC). 3 Preferred – This drug is available at a preferred co-pay.
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Color of chemicals (January 2008). The color of chemicals is a physical property of chemicals that in most cases comes from the excitation of electrons due to an absorption of energy performed by the chemical. What is seen by the eye is not the color absorbed, but the complementary color from the removal of the absorbed wavelengths. The study of chemical structure by means of energy absorption and release is generally referred to as spectroscopy.
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Chemiluminescence Chemiluminescence is the generation of electromagnetic radiation as light by the release of energy from a chemical reaction.While the light can, in principle, be emitted in the ultraviolet, visible or infrared region, those emitting visible light are the most common.hemiluminescence is the generation of electromagnetic radiation as light by the release of energy from a chemical reaction.
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- Safe 'n Easy® Non-Toxic Efflorescence Remover does not contain any harmful hydrofluoric acid, bleach, abrasives, caustic, mineral acids or petroleum distillates, making it a safe green cleaning product, ready for homeowners to use without diluting.
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- Efflorescence is a condition wherein white deposits form on the surface of the concrete. These deposits often contain calcium, sodium and potassium hydroxides or carbonates, bicarbonates, chlorides and sulfates of calcium and magnesium.
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Effervescence Definition Effervescence Definition: Foaming formed as a result of a gas being evolved from a solid or liquid.