Here's why:

* Intermolecular forces: Liquids have weaker intermolecular forces than solids. This means the molecules in a liquid are less tightly bound and have more freedom to move around.

* Spacing: The molecules in a liquid are farther apart than those in a solid. This increased spacing allows for more expansion when the temperature increases.

In simpler terms: Imagine a box filled with marbles (representing molecules). In a solid, the marbles are tightly packed. In a liquid, they have more space to move around. When you heat the box, the marbles in the liquid will spread out more than the marbles in the solid, leading to a larger volume change (expansion).

Example: Water expands when it freezes because the molecules arrange themselves in a less compact structure in ice. This is an extreme example, but it illustrates the concept of how liquids can have greater volume expansion compared to solids.