Traditional Culture Encyclopedia - Photography major - Why doesn't oil mix with water?

Why doesn't oil mix with water?

Oil and water are immiscible, because the molecular structures of water and oil are very different, and the molecules cannot be combined with each other, so they are immiscible. Oil with the same volume is much lighter than water, so oil always floats on the water. Oil is organic and water is inorganic. Generally speaking, the solubility of oil in water is divided into: insoluble, the density of oil is smaller than that of water, so the oil will float on the water surface and will not mix, but if the density is the same, it can be mixed together even if it is insoluble.

Water is a polar molecule, while oil is a fat-soluble molecule. According to the principle of similarity and compatibility, they are immiscible with each other. Here we need to distinguish the concepts of dissolution and mixing. Alcohol is extremely soluble in water. Although its density is lower than that of water, it has completely dissolved in water. The solubility of oil in water can be divided into: insoluble, but chemically insoluble means that the solubility is less than an index, but it cannot be completely insoluble at 100%, so the oil on it still contains a little water, but the proportion is very small.