What caused the order of the layers can be attributed to the densities of the liquids.
- The density of a substance is an indication of how heavy the substance is in relation to its volume. Mathematically, it is given as mass/volume.
- Hence, a liquid with a higher density will always be at the bottom of a liquid with a lower density provided that both of them are of the same volume.
In order words, immiscible liquids poured together in the same container will separate out according to their densities - starting with the highest density liquid occupying the bottom with the lowest density liquid staying topmost.
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