The story of magnesium. Physical and mechanical properties.
The history of the discovery of this metal is closely connected with thermal mineral springs in England, where he began to produce bitter salt. The formula of this salt is MgSO4. From it was subsequently allocated magnesium in pure form. .
This is a very lightweight metal. Its surface is covered with the oxide film, which is destroyed at 623 °C, after which Mg is burned. Magnesium powder and the foil is ignited with ordinary matches and burn in air and carbon dioxide. Such as — burning bright dazzling flame is indispensable in signal and lighting missiles, shells and tracer bullets, incendiary bombs.
|Atomic (molar) mass, g/mol||24,3|
|The melting temperature t°C||650°C|
|The heat of fusion kJ/mol||9,2|
|The thermal conductivity K [W/(m·K)]||158|
|Heat of evaporation kJ/mol||131,8|
This is one of the most high-tech metals: it is well pressed, bent, easily drilled, cut, rolled. But pure magnesium is rather fragile so as a construction material is more valuable for its alloys.
Percentage composition of magnesium ingots (GOST 2581−78)
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