Science, Tech, Math › Science Heterogeneous Definition (Science) What Heterogenous Means in Science Share Flipboard Email Print This is a heterogenous mixture of buttons of different shapes and sizes. Danille Cageling / EyeEm, Getty Images Science Chemistry Basics Chemical Laws Molecules Periodic Table Projects & Experiments Scientific Method Biochemistry Physical Chemistry Medical Chemistry Chemistry In Everyday Life Famous Chemists Activities for Kids Abbreviations & Acronyms Biology Physics Geology Astronomy Weather & Climate By Anne Marie Helmenstine, Ph.D. Chemistry Expert Ph.D., Biomedical Sciences, University of Tennessee at Knoxville B.A., Physics and Mathematics, Hastings College Dr. Helmenstine holds a Ph.D. in biomedical sciences and is a science writer, educator, and consultant. She has taught science courses at the high school, college, and graduate levels. our editorial process Facebook Facebook Twitter Twitter Anne Marie Helmenstine, Ph.D. Updated August 08, 2019 The word heterogeneous is an adjective that means composed of different constituents or dissimilar components. In chemistry, the word is most often applied to a heterogeneous mixture. This is one which has a non-uniform composition. A mixture of sand and water is heterogeneous. Concrete is heterogeneous. In contrast, a homogeneous mixture has a uniform composition. An example is a mixture of sugar dissolved in water. Whether a mixture is heterogeneous or homogeneous is largely dependent on the scale or sample size. For example, if you look at a container of sand, it may appear to have evenly distributed particles (be homogeneous). If you viewed the sand under a microscope, you might find unevenly distributed clumps of different materials (heterogeneous). In materials science, specimens may consist entirely of the same metal, element, or alloy, yet display heterogeneous phases or crystal structure. For example, a piece of iron, while homogeneous in composition, might have regions of martensite and others of ferrite. A sample of the element phosphorus might contain both white and red phosphorus. In the broader sense, any group of dissimilar objects may be described as being heterogeneous. A group of people might be heterogeneous with respect to age, weight, height, etc.