👉 The term "immiscible" refers to two substances that are completely incompatible or unable to be mixed together, and do not form a single mixture. For example: 1. Milk and water cannot mix because they are immiscible. 2. Alcohol and water can mix but they are not immiscible. In chemistry, immiscibility is important for many processes in which two substances must be separated or mixed. It allows us to separate different components of a mixture without changing the total volume or