An emulsifying agent is a substance that helps to blend two or more immiscible liquids such as oil and water. Some common synonyms for emulsifying agent include emulsifier, surfactant, and wetting agent. These terms all refer to substances that are capable of reducing the surface tension between two liquids, allowing them to mix more easily. Other synonyms for emulsifying agents might include dispersing agents or colloid stabilizers. Some common examples of emulsifying agents include soap, egg yolks, and lecithin. These substances are often used in a variety of applications, from cooking and food processing to pharmaceuticals and industrial manufacturing processes.