Definition:Elementary Charge/Historical Note
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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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