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Sharp glass edges are heated for making ...

Sharp glass edges are heated for making them smooth (polishing of glass) which is due to its

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**Step-by-Step Solution:** 1. **Understanding the Problem**: The question asks why sharp glass edges are heated to make them smooth, a process known as polishing glass. 2. **Heating Glass**: When glass is heated, it undergoes a change in its physical state. Specifically, it begins to melt. This melting process is crucial for the smoothing of sharp edges. 3. **Behavior of Liquid Glass**: As the glass melts, it transforms into a liquid state. In this state, the surface of the liquid glass behaves according to the principles of surface tension. 4. **Surface Tension and Shape**: The surface tension of the liquid glass causes it to minimize its surface area. This results in the liquid glass adopting a rounded shape, especially at the edges. 5. **Smoothing the Edges**: As the sharp edges of the glass are heated and the glass melts, the edges become rounded due to the surface tension of the molten glass. This rounding effect effectively smooths out the sharp edges. 6. **Conclusion**: Therefore, the reason sharp glass edges are heated for polishing is that the heating causes the glass to melt, and the molten glass takes on a rounded shape due to surface tension, smoothing the edges in the process. ---
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