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10-minute experiment

Vinaigrette with and without mustard

Does a spoon of mustard hold oil and vinegar together?

The idea

A vinaigrette with mustard stays blended longer than one without it.

The one thing you change: Mustard or no mustard

You need

  • 3 tbsp oil
  • 1 tbsp vinegar
  • 1 tsp mustard (skip this one if allergic)
  • Two small jars with lids
  • A timer

Steps

What you should find

The plain jar separates within a minute or two. The mustard jar stays cloudy and blended much longer.

The science behind it

How emulsions work

An emulsion is tiny droplets of one liquid spread through another, like oil in vinegar. Left alone, the droplets merge and the layers separate. An…

Read the explainer

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