Why does salad dressing have to be shaken?

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The ingredients that make up the dressings contents will settle as their individual weight relative to another may be lighter or heavier. For instance, oil will float to the top - water is heavier than oil. It's an applied chemistry kind of thing.

Shaking it will mix them for a very short time; to keep them mixed for longer, you need an emulsifier; mustard works well and happens to be a nice ingredient in dressing as well.

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First answer by Bozidar. Last edit by Jayrusalem. Contributor trust: 634 [recommend contributor]. Question popularity: 42 [recommend question]

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