Homogeneous and heterogeneous mixtures - wikipedia Homogeneous and heterogeneous mixtures A homogeneous mixture is a solid, liquid or gaseous mixture that has the same proportions of its components throughout a given sample ( or multiple samples of different proportion ). Homogeneous mixtures can have a variable composition. Conversely, a heterogeneous mixture does not have uniform in composition, but proportions of its components vary throughout the sample. `` Homogeneous '' and `` heterogeneous '' are not absolute terms, but depend on context and size of the sample. In chemistry, a homogeneous suspension of material means that when dividing the volume in half, the same amount of material is suspended in both halves of the substance. However, it might be possible to see the particles under the microscope. An example of a homogeneous mixture is air. In physical chemistry and materials science that refers to substances and mixtures which are in a single phase. This is in contrast to a substance that is heterogeneous. A figure reprinting at the atomic level the differences between homogeneous mixtures, heterogeneous mixtures, compounds, and elements. Contents 1 Homogeneous mixture 1.1 Solutions 1.2 Gaseous 1.3 Solids 2 Metrics 3 Homogenization 4 References Homogeneous mixture Solutions A solution is a special type of homogeneous mixture. Solutions are homogeneous because the ratio of solute to solvent remains the same throughout the solution even if homogenized with multiple sources, and stable because the solute will not settle out after any period of time, and it can not be removed by a filter or by centrifuge. This type of mixture is very stable, i.e., its particles do not settle, or separate. As a homogeneous mixture, a solution has one phase ( liquid ) although the solute and solvent can vary : for example, salt water. Gaseous Air can be more specifically described as a gaseous solution ( oxygen and other gases dissolved in the major component, nitrogen ). Since interactions between molecules play almost no role, dilute gases form rather trivial solutions. In part of the literature, they are not even classified as solutions. Solids In chemistry, a mixture is a substance containing two or more elements or compounds that are not covalently bound to each other and which retain their own chemical and physical identities ; -- a substance which has two or more constituent physical substances. Mixtures, in the broader sense, are two or more substances physically in the same place, but these are not chemically combined, and therefore ratios are not necessarily considered. Metrics Homogeneous mixtures have the same proportions of the various components throughout a given sample ( or multiple samples of different proportion ), creating a consistent mixture. However, two homogeneous mixtures of the same pair of substances may differ widely from each other and can be homogenized to make a constant. Homogeneous mixtures always have the same composition. Mixtures can be characterized by being separable by mechanical means e.g. heat, filtration, gravitational sorting, etc. During the sampling of heterogeneous mixtures of particles, the variance of the sampling error is generally non-zero. Gy 's sampling theory quantitatively defines the heterogeneity of a particle as : h i = ( c i − c batch ) m i c batch m aver. ( displaystyle h_ ( i ) = ( \frac ( ( c_ ( i ) - c_ ( \text ( batch ) ) ) m_ ( i ) ) ( c_ ( \text ( batch ) ) m_ ( \text ( aver ) ) ) ). ) h i ( displaystyle h_ ( i ) ), the heterogeneity of the i ( displaystyle i ) th particle of the population c i ( displaystyle c_ ( i ) ), the mass concentration of the property of interest in the i ( displaystyle i ) th particle of the population c batch ( displaystyle c_ ( \text ( batch ) ) ), the mass concentration of the property of interest in the population m i ( displaystyle m_ ( i ) ), the mass of the i ( displaystyle i ) th particle in the population m aver ( displaystyle m_ ( \text ( aver ) ) ), the average mass of a particle in the population Homogenization Main articles : Homogenization ( chemistry ) and Mixing ( process engineering ) References Jump up ^ Lew, Kristi ( 2009 ). `` Homogeneous ''. Acids and Bases, Essential Chemistry. New York : Chelsea House Publishing. Online publisher : Science Online. Facts On File, Inc. ISBN 978 - 0 - 7910 - 9783 - 0. access date : 2010 - 01 - 01 Jump up ^ `` Solution ( chemistry ) '' ( authors : William Ashworth and Charles E. Little ) chapter - format = requires chapter - url = ( help ). Encyclopedia of Environmental Studies, New Edition. Online publisher : Science Online. Facts On File, Inc. 2001. access date : 2010 - 01 - 01 ^ Jump up to : `` Mixture '' ( authors : William Ashworth and Charles E. Little ) chapter - format = requires chapter - url = ( help ). Encyclopedia of Environmental Studies. Online publisher : Science Online. Facts On File, Inc. 2001. access date : 2010 - 01 - 01 Jump up ^ Gy, P. ( 1979 ), Sampling of Particulate Materials : Theory and Practice, Elsevier : Amsterdam, 431 pp. Retrieved from `` https://en.wikipedia.org/w/index.php?title=Homogeneous_and_heterogeneous_mixtures&oldid=825813517 '' Categories : Chemical mixtures Hidden categories : Pages using citations with format and no URL Talk Contents About Wikipedia தமிழ் Edit links This page was last edited on 15 February 2018, at 15 : 51. Text is available under the Creative Commons Attribution - ShareAlike License ; additional terms may apply. By using this site, you agree to the Terms of Use and Privacy Policy. Wikipedia ® is a registered trademark of the Wikimedia Foundation, Inc., a non-profit organization. About Wikipedia

Question: what is a sample of matter that has the same composition and properties throughout
Answer: homogeneous mixture