PSI Barbering Practice Exam

An example of a water-in-oil emulsion is:

1. Shampoo

2. Cold cream

3. Hair gel

4. Aqueous lotion

The correct answer is: Cold cream

A water-in-oil emulsion consists of water droplets dispersed in an oil phase, creating a thick, creamy texture. Cold cream is a classic example of such an emulsion, as it typically contains a significant amount of oil, such as mineral oil or petroleum, along with water and emulsifiers to stabilize the mix. The predominant oily base helps to provide a rich, moisturizing effect, making it suitable for applications like cleansing or moisturizing the skin. In contrast, choices like shampoo and hair gel are primarily water-based products with emulsifiers. These products typically do not contain a higher oil content, which is what characterizes a water-in-oil emulsion. Aqueous lotions also lean towards oil-in-water emulsions, wherein oil is dispersed in water, making them lighter and less creamy compared to cold creams. Therefore, cold cream stands out as the correct example of a water-in-oil emulsion due to its specific formulation and texture.