Here's why:
* Density is defined as mass per unit volume.
* Gases have molecules that are far apart and move freely, making them very spread out. This means they have a low density.
* Liquids have molecules closer together than gases, resulting in higher density.
* Solids have molecules tightly packed together, leading to the highest density among the three states of matter.
Therefore, solids are the most dense state of matter, followed by liquids, and then gases.
