Why do some substance exist as solids?

Explanation

**Step-by-Step Text Solution:**

1. **Understanding States of Matter**: Matter can exist in three primary states: solid, liquid, and gas. Each state is characterized by the arrangement and behavior of its constituent particles.

2. **Role of Forces of Attraction**: The state of a substance is largely determined by the forces of attraction between its particles. In solids, these forces are strong, leading to a fixed and orderly arrangement of particles.

3. **Influence of Thermal Energy**: Thermal energy refers to the energy that particles possess due to their motion. In solids, the thermal energy is relatively low compared to the forces of attraction, which keeps the particles closely packed together.

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