Density

Real World Example

Imagine trying to pack a suitcase for a long trip, but you have limited space. This is similar to the concept of density, where you are concerned with how much "stuff" (mass) you can fit into a given amount of space (volume). Just like you need to decide which items are essential and how to efficiently arrange them to maximize space, density measures how much mass is packed into a unit of volume, showing the compactness of the material.