If an object's mass remains constant but its volume is increased, its density will decrease.

Here's why:

* Density is defined as mass per unit volume.

* Mass is the amount of matter in an object.

* Volume is the amount of space an object occupies.

Since the mass stays the same, but the volume increases, you're dividing the same amount of mass by a larger volume. This results in a smaller number, indicating a lower density.

Think of it this way: Imagine you have a block of clay. If you keep the same amount of clay (mass) but spread it out to take up more space (volume), it becomes less dense. The clay is now thinner and lighter.