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Answer on Molecular Physics | Thermodynamics Question for Mary

Question #88
A block, carved from a single crystal, while being heated, can turn into a parallelepiped. Why is this possible?
Expert's answer
Single crystals may have different internal symmetry, and their coefficients of expansion along different directions of symmetry are also different. A block will remain the shape of a cube only if it is made from an amorphous body (without symmetry), or a cubic crystal (all directions are equal).

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