When a glass rod is heated at high temperature, why does its ends… - Vidyadip

Question

When a glass rod is heated at high temperature, why does its ends becomes rounded?

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Answer

When an end of a glass tube is heated it melts and becomes liquid. Due to surface tension liquid tries to occupy minimum surface area. For any given volume the surface area of a sphere is minimum so the molten glass at the ends becomes spherical. So the ends of a glass tube become round on heating.

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