For any substance, why does the temperature remains constant during the change of state?

Explanation

**Step-by-Step Solution:**

1. **Understanding Change of State**:
- A substance can exist in different states: solid, liquid, and gas. When a substance changes from one state to another (e.g., solid to liquid, liquid to gas), this is known as a change of state.

2. **Heat Energy and Temperature**:
- When a substance undergoes a change of state, heat energy is supplied to it. This heat energy is essential for the transformation of the substance from one state to another.

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