\begin{definition}[Definition:Electric Charge/Quantum]
'''Electric charge''' has been demonstrated to be quantized.
The quantum of electric charge is the elementary charge $\E$:
:$\E = 1.60217 \, 6634 \times 10^{−19}$ coulombs ''exactly''.
{{OEIS|A081823}}
This is so small that to all practical purposes in everyday measurement of electricity, it can be treated as though it were continuous.
\end{definition}