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An anisotropic crystal has linear expansion coefficients of 0.00004 /°C, 0.00005 /°C, and 0.00006 /°C along its three mutually perpendicular axes. What is the coefficient of cubical (volume) expansion of the crystal?

1. 0.000015 /°C
2. 0.00015 /°C
3. 0.00012 /°C
4. 0.00018 /°C

Correct answer: 0.00015 /°C

Solution

γ = α1 + α2 + α3 = 0.00004 + 0.00005 + 0.00006 = 0.00015 /°C.

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