Page "Beryllium" Paragraph 3
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Beryllium is a steel gray and hard metal that is brittle at room temperature and has a close-packed hexagonal crystal structure.
It has exceptional flexural rigidity ( Young's modulus 287 GPa ) and a reasonably high melting point.
The modulus of elasticity of beryllium is approximately 50 % greater than that of steel.
The combination of this modulus and a relatively low density results in an unusually fast sound conduction speed in beryllium – about 12. 9 km / s at ambient conditions.
Other significant properties are high specific heat ( 1925 J · kg < sup >− 1 </ sup >· K < sup >− 1 </ sup >) and thermal conductivity ( 216 W · m < sup >− 1 </ sup >· K < sup >− 1 </ sup >), which make beryllium the metal with the best heat dissipation characteristics per unit weight.
In combination with the relatively low coefficient of linear thermal expansion ( 11. 4 × 10 < sup >− 6 </ sup > K < sup >− 1 </ sup >), these characteristics result in a unique stability under conditions of thermal loading.
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