Why does sharp glass edge become smooth on heating it upto its melting point in a flame ? Explain which property of liquids is responsible for this phenomenon.

Explanation

### Step-by-Step Solution:

1. **Understanding the Problem**: The question asks why sharp glass edges become smooth when heated to their melting point in a flame.

2. **Heating the Glass**: When glass is heated, especially at its sharp edges, it reaches a temperature where it starts to melt. The sharp edges are the points where the glass is most likely to be jagged and can cause harm.

3. **Transition to Liquid State**: As the glass heats up to its melting point, it transitions from a solid state to a liquid state. In this liquid state, the glass is no longer rigid and can flow.

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