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翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Planck charge ： ウィキペディア英語版 Planck charge In physics, the Planck charge, denoted by $q\_\backslash text$, is one of the base units in the system of natural units called Planck units. It is a quantity of electric charge defined in terms of fundamental physical constants. The Planck charge is defined as: :$q\_\backslash text\; =\; \backslash sqrt\; =\; \backslash frac$ coulombs, where: :$c\; \backslash$ is the speed of light in the vacuum, :$\backslash hbar$ is the reduced Planck constant, :$\backslash epsilon\_0\; \backslash$ is the permittivity of free space :$e\; \backslash$ is the elementary charge :$\backslash alpha\; \backslash$ is the fine structure constant. The Planck charge is $\backslash alpha^\; \backslash approx\; 11.706$ times larger than the elementary charge ''e'' carried by an electron. The Gaussian cgs units are defined so that $4\; \backslash pi\backslash epsilon\_0\; =\; 1$, in which case $q\_\backslash text$ has the following simple form: :$q\_\backslash text\; =\; \backslash sqrt.$ It is customary in theoretical physics to adopt the Lorentz–Heaviside units (also known as rationalized cgs). When made natural ($c=1$) they are like the SI system with $\backslash epsilon\_0\; =\; \backslash mu\_0\; =\; 1$. Therefore it is more appropriate to define the Planck charge as :$q\text{'}\_\backslash text\; =\; \backslash sqrt\; =\; \backslash frac$ coulombs, When charges are measured in units of $q\text{'}\_\backslash text$, i.e., when $q\text{'}\_\backslash text$ is set equal to 1, we obtain $\backslash alpha\; =\; \backslash frac$, which is commonly used in theoretical physics. In contrast, in (non-rationalized) natural cgs units where $q\_\backslash text=1$ we have $\backslash alpha\; =\; e^2$. ==See also== *Orders of magnitude (charge) 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「Planck charge」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.