Water-in-oil

Water-in-oil refers to an emulsion where tiny droplets of water are dispersed throughout an oil phase. This occurs when water is mixed with oil but does not separate quickly, creating a mixture with water suspended inside the oil. Such emulsions are common in products like creams, cosmetics, and certain lubricants, and require stabilizers to maintain the mixture. The water droplets are evenly distributed and small enough to stay suspended, preventing separation over time. This structure is useful for delivering active ingredients or achieving specific physical properties in various formulations.