Definition:Elementary Charge/Historical Note

Historical Note on Elementary Charge

Until the $2019$ definition of the elementary charge as exactly $\E = 1.60217 \, 6634 \times 10^{−19} \, \mathrm C$, it was the subject of measurement.

This measurement has been accomplished to greater and greater accuracy over time.

By $1964$, it was established as:

$\E = 1 \cdotp 60219 \, 17 \pm 0 \cdotp 00000 \, 70 \times 10^{−19} \, \mathrm C$

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