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Emulsion is the mixture of two or more liquids that do not naturally mix together. A classic example of emulsion in cooking the mixture oil and vinegar to make a simple vinaigrette.

There are two types of emulsion, temporary and permanent. A simple vinaigrette, the combination of oil and vinegar, is an example of a temporary emulsion because the two liquids only briefly stay together before re-separating. On the other had, mayonnaise, the combination of oil, egg yolks, and lemon juice or vinegar is an example of a permanent emulsion. Normally, these ingredients do not mix together, but once they have been slowly whisked together, the substances will not separate. 


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