出典:Wikipedia
出典:『Wikipedia』 (2011/04/02 10:59 UTC 版)
The elementary charge, usually denoted as e, is the electric charge carried by a single proton, or equivalently, the absolute value of the electric charge carried by a single electron. This elementary charge is a fundamental physical constant. To avoid confusion over its sign, e is sometimes called the elementary positive charge. This charge has a measured value of approximately 1.602176487(40)×10−19
coulombs. In the cgs system, e is 4.80320427(12)×10−10
statcoulombs.