Richardson's constant
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Richardson's constant is used in the field of thermionic emission. It is defined as:
- <math>A = {4 \pi m k^2 e \over h^3} = 1.20173 \times 10^6 {A \over m^2 K^2}<math>
where m and e represent the mass and charge of an electron, k is the Boltzmann constant, and h is Planck's constant. The value of Richardson's constant can be calculated to be 1.20173494*10^8.