Here's a breakdown:

* Compress: This means the object's volume is reduced. Imagine squeezing a sponge – you are compressing it, making its molecules closer together.

* Densify: This means the object's density increases. Density is the amount of mass per unit volume. When molecules are closer, the same amount of mass is packed into a smaller space, resulting in higher density.

Let me know if you have any other questions!