Density

: Since density is unique to each substance at a given temperature, it is often used to identify unknown materials.

Density is a fundamental physical property that describes how much mass is contained within a specific volume. It is an , meaning it remains constant for a substance regardless of the total amount present. The Core Concept Definition : The ratio of an object's mass to its volume. Formula : density

: An object will float in a fluid if its density is lower than the fluid's and sink if it is higher. Water has a defined density of 1.0 g/cm³. : Since density is unique to each substance

: Think of it as how "tightly packed" the matter is. For example, a cubic centimeter of bricks is much denser (1.6 g/cm³) than a cubic centimeter of feathers (0.0025 g/cm³). Key Characteristics The Core Concept Definition : The ratio of

“The simple answer is how heavy something is for its size. If something seems very heavy for its size, we say it is more dense.” Purdue University

Users often find the relationship between size and weight the most intuitive way to grasp the concept.