Homogeneous mixtures are a type of mixture that are perfectly uniform in their composition, as opposed to heterogeneous mixtures.
A homogeneous mixture does not scatter light and its particles can not be separated by filtration. Its particle size is about10−9cm. Its particles are very difficult to differentiate even under a microscope. A homogeneous mixture shows the properties of its components and does not show the Tyndall effect. It is also called a solution. The mixture is very stable, i.e., its particles do not settle, or separate. The definition of homogenous strongly depends on the context used. For example, in geology a homogeneous rock could be made from microscopic grains of several minerals which show strongly varying properties. In chemistry, a homogeneous suspension of material means that per volume the same amount of material is suspended in the substance, although it might be possible to see the particles under a microscope. A homogeneous solution has one phase (liquid) although the solute and solvent can vary: for example, salt water. In chemistry, another homogeneous substance is air. It is equally suspended, and the particles and gases and liquids cannot be analyzed separately or pulled apart. Mixtures, in the broader sense, are two or more substances physically in the same place, but is not chemically combined, and therefore ratios are not necessarily considered.
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