Q. 53

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.

Answer :

On heating, glass melts and the surface of the surface of the liquid tends to take the rounded shape at the edges which has minimum surface area. The property of liquid responsible for this phenomenon is “Surface Tension” of the liquid due to which the melted glass tends to take the minimum surface area i.e. sphere or spherical shape. This phenomenon is also known as the “fire polishing of the glass”.

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