# Fundamental Physical Constants

### - table or chart of the electrical and physical constants used in a variety of ways including in electronics design.

There is a large number of physical constants and fundamental that are used in physics and electronics engineering.

These constants can be used in a variety of electronics calculations and may be very useful on occasions. Although not widely used in electronics design, they may nevertheless be used on occasions.

A physical constant is a quantity that is generally believed to be universal in nature and constant over time. In other words, apart from improvements in measurement accuracies, it will remain the same.

These physical constants appear in many areas of science and they take many forms.

Common examples of some fundamental physical constants are the speed of light in a vacuum and it has the dimensions of speed, i.e. length divided by time. Other physical constants have different dimensions, or some can be dimensionless.

## Physical constant groupings

In order to be able to refer to the different physical constants and fundamental constants more easily, we have split them into different groups as seen below:

• Universal constants:   Universal constants are those which are used in many areas of science. They include some of the fundamental constants such as the speed of light, permittivity and permeability in a vacuum, gravitational forces and Planck's constant. Read more . . .
• Electromagnetic constants:   The electromagnetic constants are those constants within the overall physical constants that pertain to electromagnetic aspects. They include such items as the elementary charge, magnetic flux quantum, the Josephson frequency-voltage quotient and the like. Read more . . .
• Atomic constants:   There are many fundamental physical constants associated with atomic level physics, etc. These atomic constants include values such as Rydberg constant, Bohr radius, Hartree energy, etc Read more . . .
• Electron constants:   There are many physical or fundamental constants associated with electrons. These electron constants include values such as electron specific charge, electron molar mass, electron specific charge, etc. Read more . . .
• Proton constants:   These physical constants are applicable to proton characteristics and include characteristics such as proton mass, proton specific charge, proton molar mass, proton magnetic moment etc. Read more . . .
• Neutron constants:   These physical constants are related to neutrons, and include parameters such as neutron mass, neutron-electron mass ratio, neutron molar mass, etc.. Read more . . .
• Physicochemical constants & parameters:   These physical constants include parameters related to physic-chemical characteristics and include items such as Avagadro constant, Faraday constant, Boltzmann constant, standard atmosphere and many more. Read more . . .

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## Read more popular reference pages & tables . . . . .

dBm / Watts table Trig functions Fourier series Constants
SI base units SI prefixes Sidereal time Greek letters
Resistivity Physical constants Capacitance Circuit symbols

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