miscibility
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thumb|Diesel fuel is immiscible in [[water. The bright rainbow pattern is the result of thin-film interference.]] Miscibility () is the property of two substances to mix in all proportions (that is, to fully dissolve in each other at any concentration), forming a homogeneous mixture (a solution). Such substances are said to be miscible (etymologically equivalent to the common term "mixable"). The term is most often applied to liquids, but also applies to solids and gases. An example in liquids is the miscibility of water and ethanol as they mix in all proportions.
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thumb|Diesel fuel is immiscible in [[water. The bright rainbow pattern is the result of thin-film interference.]] Miscibility () is the property of two substances to mix in all proportions (that is, to fully dissolve in each other at any concentration), forming a homogeneous mixture (a solution). Such substances are said to be miscible (etymologically equivalent to the common term "mixable"). The term is most often applied to liquids, but also applies to solids and gases. An example in liquids is the miscibility of water and ethanol as they mix in all proportions.
By contrast, substances are said to be immiscible if the mixture does not form a solution for certain proportions. For one example, oil is not soluble in water, so these two solvents are immiscible. As another example, butanone (methyl ethyl ketone) is immiscible in water: it is soluble in water up to about 275 grams per liter, but will separate into two phases beyond that.