mixture

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Related to Homogeneous mixture: Heterogeneous mixture

mixture,

in chemistry, a physical combination of two or more pure substances (i.e., elements or compounds). A mixture is distinguished from a compound, which is formed by the chemical combination of two or more pure substances in a fixed, definite proportion. The components of a mixture retain their own chemical properties and may be present in any proportion. For example, iron filings may be mixed with powdered sulfur in any proportion, and even if very fine iron powder is carefully mixed with powdered sulfur, the two components are easily separated by means of a magnet; the magnet will draw out the iron from the mixture. However, if seven parts by weight of iron filings or powder are mixed with four parts by weight of powdered sulfur and the mixture is heated to a red glow (e.g., in a test tube, using a Bunsen burner), the iron and sulfur react to form the compound iron sulfide; they are chemically combined and are not readily separated. The iron sulfide is not attracted by a magnet. Mixtures are often classified as homogeneous or heterogeneous. Solutionssolution,
in chemistry, homogeneous mixture of two or more substances. The dissolving medium is called the solvent, and the dissolved material is called the solute. A solution is distinct from a colloid or a suspension.
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 and colloidscolloid
[Gr.,=gluelike], a mixture in which one substance is divided into minute particles (called colloidal particles) and dispersed throughout a second substance. The mixture is also called a colloidal system, colloidal solution, or colloidal dispersion.
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 are homogeneous mixtures. The components of a homogeneous mixture are too intimately combined to be distinguished from one another by visual observation. A suspensionsuspension,
in chemistry, mixture of two substances, one of which is finely divided and dispersed in the other. Common suspensions include sand in water, fine soot or dust in air, and droplets of oil in air. A suspension is different from a colloid or solution.
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 is a heterogeneous mixture. The particles in a heterogeneous mixture are coarse enough to be distinguished by visual observation. Alloys are mixtures of metals and may be either homogeneous or heterogeneous. The components of a mixture usually can be separated by physical means such as distillation, evaporation, precipitation, filtration, solvent extraction, or chromatography.
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mixture

[′miks·chər]
(pharmacology)
A liquid medicine prepared by adding insoluble substances to a liquid medium, usually with a suspending agent.
(science and technology)
The product of mixing; components are not in a fixed proportion to each other.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.

mixture

1. The assembled, blended, commingled ingredients of mortar, concrete, or the like.
2. The proportions for their assembly.
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.

mixture

1. Chem a substance consisting of two or more substances mixed together without any chemical bonding between them
2. Pharmacol a liquid medicine in which an insoluble compound is suspended in the liquid
3. Music an organ stop that controls several ranks of pipes sounding the upper notes in a harmonic series
4. the mixture of petrol vapour and air in an internal-combustion engine
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005
References in periodicals archive ?
Formulation [T.sub.g0] [T.sub.g,DSC] [T.sub.g,DSC,Fox] (a) (b) (c) ([degrees]C) ([degrees]C) ([degrees]C) Neat -56 195 195 H3Ovin 2% -57 183 184 5% -58 180 167 10% -60 168 143 15% -61 162 126 H30epo 2% -53 193 189 5% -54 183 180 10% -55 184 166 15% -56 180 152 Formulation [T.sub.g,Tan[delta]] (d) ([degrees]C) Neat 191 H3Ovin 2% 184 5% 179 10% 162 15% 158 H30epo 2% 187 5% 174 10% 172 15% 178 (a) Glass transition temperature of uncured samples at a rate of 10 K * [min.sup.-1] (b) Glass transition temperature of samples cured at a rate of 10 K * [min.sup.-1] (c) Glass transition temperature calculated using the DSC data and Fox cqualion assuming an homogeneous mixture of DGEBA and H3Oepo.
Depending upon the design parameters of the system, various grades of lubricants are produced by blending selected additives with lube base oils of different viscosity to render a homogeneous mixture - needed for particular demands.
It also assumes that the return sand system will properly blend the sand into one homogeneous mixture and remove all lumps and metallics.
This novel flow-induced flame-extent confinement field is found to reduce convective wall heat transfer losses by 50% compared to a combustion chamber design that actualizes a homogeneous mixture without specific charge motion directionality.
In order to study the pyrolysis of LDPE in the presence of catalyst a homogeneous mixture of pure LDPE and alumina acidic active as catalyst was prepared in the ratio of 5 10 15 and 20% (w/w).
While many earlier studies considered a homogeneous mixture a worst-case scenario and consequently neglected the role of inhomogeneities, the influence of concentration gradients has only recently come into the focus of research [29, 33, 34].
Although blenders are designed for blending all powders to a homogeneous mixture, loading DOES have an effect on the outcome.
The vermicomposts are much darker than the original materials and form compost-like, homogeneous mixture after just 180 days.
The sodium hydroxide and the sodium silicate solutions were first mixed with each other and stirred to obtain a homogeneous mixture of the solutions before adding them to the solids.
The technology can achieve large production widths thanks to patented forming heads to enable the production of nonwovens from 100% pulp or from a homogeneous mixture of different types of fibers as well as super absorbent powders.
Mixing rates from 500 to 2500 rpm ensure a homogeneous mixture within the reaction vessel and thus quantifiable and repeatable experiments.

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