The coefficient of linear expansion of a crystal in one direction is α1 and that in every direction perpendicular to it is α2.

The coefficient of linear expansion of a crystal in one direction is α₁ and that in every direction perpendicular to it is α₂. The coefficient of cubical expansion is

(1) α₁ + α₂

(2) 2α₁ + α₂

(3) α₁ + 2α₂

(4) None of above

The coefficient of linear expansion of a crystal in one direction is α1 and that in every direction perpendicular to it is α2.

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