In physics, the Planck charge, denoted by , is one of the base units in the system of natural units called Planck units. It is a quantity of electric charge defined in terms of fundamental physical constants.
- is the speed of light in the vacuum,
- is the reduced Planck constant,
- is the permittivity of free space
- is the elementary charge
- is the fine structure constant.
The Gaussian cgs units are defined so that , in which case has the following simple form:
It is customary in theoretical physics to adopt the Lorentz–Heaviside units (also known as rationalized cgs). When made natural () they are like the SI system with . Therefore it is more appropriate to define the Planck charge as
When charges are measured in units of , i.e., when is set equal to 1, we obtain , which is commonly used in theoretical physics. In contrast, in (non-rationalized) natural cgs units where we have .
Notes and references
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- Pavšič, Matej (2001). The Landscape of Theoretical Physics: A Global View. Dordrecht: Kluwer Academic. pp. 347–352. ISBN 0-7923-7006-6.<templatestyles src="Module:Citation/CS1/styles.css"></templatestyles>