The thermal expansion of solids is the least among the three states of matter. Explain.

Explanation

**Step-by-Step Solution:**

1. **Understanding Thermal Expansion**: Thermal expansion refers to the increase in volume of a substance when it is heated. Different states of matter (solids, liquids, and gases) expand to different extents when heated.

2. **States of Matter**: There are three primary states of matter: solids, liquids, and gases. Each state has distinct characteristics regarding the arrangement and movement of its particles.

3. **Characteristics of Solids**: In solids, the molecules are closely packed together. This close packing means that there is very little intermolecular space between the particles.

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