Khác biệt giữa bản sửa đổi của “Điện tích cơ bản”

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'''Điện tích cơ bản''' hay '''điện tích nguyên tố''', usually denoted as {{math|'''''e'''''}} or sometimes {{math|''q''}}, is the [[electric charge]] carried by a single [[proton]], or equivalently, the [[Negation (algebra)|negation]] (opposite) of the electric charge carried by a single [[electron]].<ref>Note that the symbol ''e'' has many other meanings. Somewhat confusingly, in [[atomic physics]], ''e'' sometimes denotes the electron charge, i.e. the ''negative'' of the elementary charge.</ref> 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 {{physconst|e|unit=no|after=&#x20;[[coulomb]]s.}} In the [[centimeter gram second system of units|cgs]] system, ''e'' is {{val|4.80320425|(10)|e=-10|u=[[statcoulomb]]s}}.<ref>This is derived from the NIST value and uncertainty, using the fact that one coulomb is ''exactly'' {{val|2997924580}} statcoulombs. (The conversion is ten times the numerical [[speed of light]] in meters/second.)</ref>