Explain different process of inter-conversions of states of matter.

Explanation

### Step-by-Step Solution:

1. **Understanding States of Matter**:
- Matter exists in three primary states: solid, liquid, and gas. Each state has distinct properties and behaviors.

2. **Solid to Liquid**:
- **Melting**: This process occurs when a solid is heated to its melting point, causing it to change into a liquid.
- **Fusion**: This term is often used interchangeably with melting, referring to the transition from solid to liquid.
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