翻訳と辞書 Words near each other ・ Volta ao Algarve ・ Volta ao Distrito de Santarém ・ Volta Ciclística Internacional do Rio Grande do Sul ・ Volta Cinematograph ・ Volta Conference ・ Volta do mar ・ Volta Feminina da República ・ Volta Glacier ・ Volta Grande ・ Volta Grande Dam ・ Volta Hall ・ Volta Hotels Limited ・ Volta Laboratory and Bureau ・ Volta Mantovana ・ Volta Mining ・ Volta potential ・ Volta powerhouses ・ Volta Prize ・ Volta Redonda ・ Volta Redonda Futebol Clube ・ Volta Region ・ Volta Regional Museum ・ Volta River ・ Volta River Authority ・ Volta Star ・ Volta Tour ・ Volta Tower ・ Volta à cidade do Funchal ・ Volta, California ・ Volta-Bani War Dictionary Lists mini英和辞書 mini和英辞書 Webster 1913 Latin-English FOLDOC Wikipedia English ウィキペディア

翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Volta potential ： ウィキペディア英語版 Volta potential The Volta potential (also called Volta potential difference, contact potential difference, outer potential difference, Δψ, or "delta psi") in electrochemistry, is the electrostatic potential difference between two metals (or one metal and one electrolyte) that are in contact and are in thermodynamic equilibrium. Specifically, it is the potential difference between a point close to the surface of the first metal, and a point close to the surface of the second metal (or electrolyte).〔(IUPAC Gold Book, definition of contact (Volta) potential difference. )〕 The Volta potential is named after Alessandro Volta. ==Volta potential between two metals== When two metals are electrically isolated from each other, an arbitrary potential difference may exist between them. However, when two different neutral metal surfaces are brought into electrical contact (even indirectly, say, through a long wire), electrons will flow from the metal with a higher Fermi level to the metal with the lower Fermi level until the Fermi levels in the both phases are equal. Once this has occurred, the metals are in thermodynamic equilibrium with each other (the actual number of electrons that passes between the two phases is usually small). Just because the Fermi levels are equal, however, does not mean that the electric potentials are equal. The electric potential outside each material is controlled by its work function, and so dissimilar metals can show an electric potential difference even at equilibrium. The Volta potential is ''not'' an intrinsic property of the two bulk metals under consideration, but rather is determined by work function differences between the metals' surfaces. Just like the work function, the Volta potential depends sensitively on surface state, contamination, and so on. The potential is given by the formula: $V\_\; =\; \backslash frac\; ln\; \backslash frac$, where VAB is the potential, *R is the gas constant, *T absolute temperature, *eA, eB, electron number densities in metals A and B. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Volta potential」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.