| 单词 | surface density |
| 释义 | > as lemmassurface density surface density n. (a) density at a surface; (Physics) the density of energy states at the surface of a solid; (b) the quantity of something per unit area of surface, such as the quantity of electric charge per unit area of the surface of a solid. ΚΠ 1833 Readings Sci. (Soc. Promoting Christian Knowl.) xix. 70 The refractive power of air, even at the surface density, is very small. 1873 J. C. Maxwell Treat. Electr. & Magnetism I. i. ii. 87 The surface-density σ′ is that of the apparent electrification produced at the surface of the solid dielectric by induction. 1918 Concrete June 219/1 (heading) Silicate of soda for surface density [of concrete]. 1935 C. J. Smith Intermediate Physics (ed. 2) v. xxxvii. 622 P, the polarization of the medium, is equal to the surface density of the electrification arising on the ends of an element. 1941 J. A. Stratton Electromagnetic Theory iv. 247 The vector M shall now represent the surface density of magnetization, the magnetic moment of the surface S per unit area. 1999 Sky & Telescope Mar. 35/2 When the overall surface density of stars is high enough, a self-gravitating disk may spontaneously form a bar. 2007 N. Majlis Quantum Theory Magnetism (ed. 2) xiii. 326 The surface density of states is lower than the bulk one at the band edges. < as lemmas |
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