Understanding the density and buoyancy of liquids is crucial in various scientific fields. Density, defined as mass per unit volume, determines the weight of liquids. Liquids with different densities behave differently when submerged in fluids, influencing their floating or sinking behavior. Archimedes’ Principle explains the upward buoyant force acting on objects submerged in fluids, which plays a role in buoyancy. Understanding these concepts enables us to identify unknown liquids, predict the floating or sinking of objects, and make connections to other scientific disciplines such as physics, where density and buoyancy are fundamental principles.