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PART - 2 CH - 9 Mechanical Properties of Fluids — Physics STD 11 Science — Question

Rajasthan BoardEnglish MediumSTD 11 SciencePhysicsPART - 2 CH - 9 Mechanical Properties of Fluids2 Marks
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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