👉 Dense refers to a substance or material that is packed with its own molecules, resulting in an increased density and volume. It can be defined as having more atoms or molecules than it would otherwise have, making it heavier and denser. In chemistry, dense substances are often used in the production of materials like plastics, metals, and ceramics. They are also significant in the study of gases, such as helium and nitrogen gas, which are often used as propellants in various chemical processes. D