“thorium”的概念、定义、习题解题方法及翻译-物理辞典

单词	thorium
释义	thorium Symbol Th. A grey radioactive metallic element belonging to the actinoids; a.n. 90; r.a.m. 232.038; r.d. 11.5–11.9 (17°C); m.p. 1740–1760°C; b.p. 4780–4800°C. It occurs in monazite sand in Brazil, India, and USA. The isotopes of thorium have mass numbers from 223 to 234 inclusive; the most stable isotope, thorium–232, has a half-life of 1.39 × 10 ¹⁰ years. It can be used as a nuclear fuel for breeder reactors as thorium–232 captures slow neutrons to breed uranium–233. Thorium dioxide (thoria , ThO₂) is used on gas mantles and in special refractories. The element was discovered by J. J. Berzelius (1779–1848) in 1829
随便看	cold fusion Coleman-Gross theorem collective excitation collective oscillation collector colliding-beam experiments colligative properties collimator collision density colloids cologarithm colorimeter colour colour charge colour photography colour television colour temperature coma combinations combined cycle combustion comet commensurate lattice common logarithm common-collector connection

物理辞典收录了3346条物理词条，基本涵盖了常用物理知识及物理英语单词词组的翻译及用法，是物理学习的有利工具。