What is oil-in-water and water-in-oil

1. The market for oil-based skincare products can be roughly divided into two categories: one is the "oil-in-water" dosage form; the other is the water-in-oil dosage form. "Oil-in-water" and "water-in-oil" are in fact two different types (forms) of skin care products. With the application of microemulsification technology, if a lipophilic emulsifier is added, a water-in-oil (W/O) type is easily formed. If it is a hydrophilic emulsifier, it belongs to the oil-in-water (O/W) type.2. Emulsification is the action of a liquid being uniformly dispersed in another liquid, which is immiscible with tiny droplets. This is an emulsion-liquid interface phenomenon. Two immiscible liquids, such as oil and water, are separated into two layers in a container. The upper layer is low-density oil and the lower layer is high-density water. If an appropriate surfactant is added, the oil is dispersed in the water under strong agitation to form an emulsion, a phenomenon known as emulsification. /feed/55e736d12f2eb9381cf54f2de0fc423ce7dd6ff8.png?token=195b38d8e37ca297a0fe219040e757fc