The substances that help in the mixing or emulsification of oil with water are surfactants.
Oil and water are two immiscible liquids. The density of oil has been lower than the density of water, thereby the oil will float on the water surface. The molecules of oil and water are polar in nature and thus repel each other.
The surfactants have been the molecules that help in the mixing or emulsification of oil with water. The surfactants have surfaces that bind with the water molecule on the one side and the oil molecule on the other side thereby helping in the mixing of oil with water.
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