When a material is heated, it undergoes thermal expansion, meaning its dimensions increase uniformly. A cavity within the material expands as if it were filled with the material itself. Imagine the cavity as a missing piece of the solid that is expanding.
A metallic ball has a spherical cavity at its centre. If the ball is heated what happens to the cavity?
Asked in WBPSC CS Prelims 2023 · Topic: Heat and Thermodynamics (Thermal Expansion (Solids, Liquids, Gases))
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