The temperature at which solid changes to liquid is called

Options

A. melting point
B. boiling point
C. evaporation
D. condensation

Explanation

**Step-by-Step Solution:**

1. **Understanding the Question**: The question asks for the specific temperature at which a solid changes into a liquid.

2. **Identifying the Options**: We have four options to consider:
- Option 1: Melting Point
- Option 2: Boiling Point
- Option 3: Evaporation
- Option 4: Condensation

3. **Defining Each Term**:
- **Melting Point**: This is the temperature at which a solid becomes a liquid. It is the point where the solid's particles gain enough energy to overcome their rigid structure and start moving freely as a liquid.
- **Boiling Point**: This is the temperature at which a liquid turns into vapor. It occurs when the vapor pressure of the liquid equals the external pressure surrounding the liquid.
- **Evaporation**: This is the process where liquid turns into vapor, but it can happen at any temperature and only at the surface of the liquid.
- **Condensation**: This is the process where vapor turns back into liquid, typically when the vapor cools down.

4. **Analyzing the Options**:
- The question specifically asks for the temperature at which a solid changes to a liquid. Based on our definitions, the melting point is the correct term that describes this transition.

5. **Conclusion**: Therefore, the correct answer to the question is **Option 1: Melting Point**.

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