| 11. | The near-perfect crystals required " are difficult to grow on Earth because gravity distorts them ."
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| 12. | A chemically pure and structurally perfect crystal lattice.
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| 13. | In section topography, even perfect crystals display fringes.
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| 14. | Perfect crystals of gem quality, deep black, smoky quartz, several feet in length have been found in the area.
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| 15. | "Anybody who knows anything about gallium arsenide chips knows that the " perfect crystal " concept is a joke,"
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| 16. | It occurs in the form of perfect crystals grouped in druses, in pegmatites, and is often of precious-stone quality.
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| 17. | The left-hand side of each crystal type shows the perfect crystal and the right-hand side the one with a defect.
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| 18. | Many systems, such as a perfect crystal lattice, have a unique ground state and therefore have zero entropy at absolute zero.
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| 19. | One approach is to begin by considering a 3D representation of a perfect crystal lattice, with the atoms represented by spheres.
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| 20. | The third law of thermodynamics states that the entropy of a perfect crystal at absolute zero, or 0 kelvin is zero.
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