氦者,舊譯氜,化學元素也,符號為He,原子序二。無色無味、無臭無毒,性惰而孤。幾無熱,可熔沸。觀乎其形,殆必為氣,若無極低之溫、極高之壓,無之以易。宇宙之中,次多次輕。蓋有乎天地初開,後之成者,無外乎核融合、核分裂二法。地球之上,多雜天然氣,取以分餾法。
千百年來,人莫之知。迨十九稘,法人詹遜察日食,見黃譜而弗知,屢究卒獲。
同位素有八,起氦三而訖氦十,以四為最豐。量子力學言超流體性、超導性者,先以究之。
其用甚衆。或作極寒之境,或為深海呼吸,或冷超導磁石,或定年歲,或盈氣球,或昇飛船,或護電弧焊、矽晶片等,不一而足。又,微吸,可易音色。
聲音動静,具錄於維基共享︰氦 |
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