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Because they are not soluble together as they have different densities. The same reason oil floats on water. Vinegar is more dense than oil, so in a sense, its sinking.

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12y ago
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7y ago

they have different density levels

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Q: Why does oil-and-vinegar salad dressing have two layers?
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Related questions

How is salad dressing a heterogeneous mixture?

A salad contain many components and two phases.


Is salad dressing a heterogeneous mixture?

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What happens after you shake vinegar salad dressing and let it sit for an hour?

Very often it will separate into two layers. The oil and the vinegar are not miscible, and you need to blend them with an emulsifier if you want to avoid separation.


Why does an oil and vinegar dressing have two layers?

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Why does an oil-and-vinegar salad dressing have two separate layers?

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