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Two liquids can form different types of emulsions. As an example, oil and water can form, first, an oil-in-water emulsion, in which the oil is the dispersed phase, and water is the continuous phase. Second, they can form a water-in-oil emulsion, in which water is the dispersed phase and oil is the continuous phase. Multiple emulsions are also possible, including a "water-in-oil-in-water" emulsion and an "oil-in-water-in-oil" emulsion.<ref>{{cite journal|pmid=17076645 |year=2006 |last1=Khan |first1=A. Y. |title=Multiple emulsions: An overview |journal=Current Drug Delivery |volume=3 |issue=4 |pages=429–43 |last2=Talegaonkar |first2=S |last3=Iqbal |first3=Z |last4=Ahmed |first4=F. J. |last5=Khar |first5=R. K. |doi=10.2174/156720106778559056}}</ref>
Emulsions, being liquids, do not exhibit a static internal structure. The droplets dispersed in the continuous phase (sometimes referred to as the "dispersion medium") are usually assumed to be [[Probability distribution|statistically distributed]] to produce roughly spherical
The term "emulsion" is also used to refer to the photo-sensitive side of [[photographic film]]. Such a [[photographic emulsion]] consists of [[silver halide]] colloidal particles dispersed in a [[gelatin]] matrix. [[Nuclear emulsion]]s are similar to photographic emulsions, except that they are used in particle physics to detect high-energy [[elementary particle]]s.
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