* Higher mass = Higher density

* Lower mass = Lower density

Here's why:

* Density is defined as the amount of mass per unit volume. Think of it like how tightly packed the matter is within a given space.

* Mass is the amount of matter in an object.

So, if you have a fixed volume (the size of the object doesn't change):

* More mass crammed into that volume means the matter is packed more tightly, resulting in higher density.

* Less mass in that same volume means the matter is less tightly packed, leading to lower density.

Example:

Imagine two identical-sized blocks of wood:

* Block A is made of a denser type of wood (like oak) and has more mass.

* Block B is made of a less dense type of wood (like balsa) and has less mass.

Even though they're the same size, Block A will be heavier because it has more mass packed into the same volume. This makes Block A denser than Block B.