Design an activity to use separating funnel to separate the mixture of mustard oil and water

By separating funnel, pour the mixture of mustard oil and water into the separating funnel. Mustard oil being lighter than water floats on top. The stopcock is opened and water is allowed to separate out. The principle is that immiscible liquid separates out in layers depending upon the densities.

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there is none because earth is stationary and flat.