| 释义 |
alu·mi·num
I. \əˈlümənəm sometimes əlˈyü-\ noun
(-s)
Etymology: New Latin, alteration of alumium, from alumina + -ium
1. : a bluish silver-white trivalent metallic element, very malleable, ductile, and sonorous and noted for its lightness, good electrical and thermal conductivity, high reflectivity, and resistance to oxidation, that is the most abundant metal in the earth's crust, of which it forms over seven percent, always occurring in combination (as in bauxite, cryolite, corundum, alunite, diaspore, turquoise, spinel, kaolin, feldspar, mica), that is manufactured by electrolysis of a solution of alumina in molten fluorides, followed sometimes by electrolytic refining, that is used usually in the form of alloys for structural purposes (as in the construction of aircraft, automobiles, and buildings), in the chemical and food-processing industries, in cooking utensils, and in electrical conductors, and that is used in the form of powder or flakes in pigments, pyrotechnic compositions, and explosives — symbol Al; see element table
2. : a nearly neutral medium-to-light gray
II. adjective
: relating to, made of, or containing aluminum
< an aluminum kettle >
< aluminum earth > |