Why does salad dressing have to be shaken?

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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