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Dressing essentials. Salad dressing is an emulsion: a mixture of two unblendable liquids, in which one liquid (in this case, the vinegar) forms tiny droplets within the other.When the vinegar is suspended in the oil, it forms a thick, glossy mixture.l Vinaigrette-type dressings are unstable â the oil and vinegar will separate again if they are left to stand around for too long. A good dressing should complement the salad, and not overpower it.hen the vinegar is suspended in the oil, it forms a thick, glossy mixture. l Vinaigrette-type dressings are unstable â the oil and vinegar will separate again if they are left to stand around for too long. A good dressing should complement the salad, and not overpower it.
Water is not very attracted to the oil and so does not dissolve it. In some salad dressings a layer of oil, like canola or olive oil, floats on top of a layer of vinegar, which is mostly water. If you shake a bottle of this kind of salad dressing, the liquids will temporarily combine.tudents will be able to explain, on the molecular level, why certain liquids, but not all, will dissolve in water. They will also be able to explain that the solubility of a liquid is a characteristic property of that liquid.