Mr10.81. ρ 2.37 g/cm3 (amorphous); 2.34 ~ 2.46 g/cm3 (crystal). Melting point of 2177 ~ 2301 ℃. The boiling point of 2550 ~ 2658 ℃. Boron has the largest volume heat, heat weight after beryllium. Slightly soluble in nitric acid, insoluble in water. Amorphous boron chemical properties and lively. Powder and air can form explosive mixture. With magnesium reduction boron anhydride system amorphous boron. Used for solid stamping engine and smokeless clean propellant.
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