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Physical Constants

Here are some physical constants and other data in the MKS system which are useful in microwave engineering.

Sources: NIST website and the CRC Handbook of Chemistry and Physics

Constant Description Value Units
k Boltzmann's constant 1.38065030E-23 Joule/Kelvin
c Velocity of light in free space 2.99792458E+08 meters/second
e Base number of natural logarithms 2.71828183E+00 none
h Planck's constant 6.62606876E-34 Joule-second
Z0 Impedance of free space 3.76730313E+02 Ohms
ε Permittivity of free space 8.85418782E-12 Farad/meter
me Electron mass 9.10938188E-31 kilogram
N Avagadro's constant 6.02214199E+23 mol-1
π Pi 3.14159265E+00 none
q Electron charge 1.60217646E-19 Coulombs
μ0 Permeability of free space* 1.25663706E-06 Henry/meter

* exact value is 4πx10-7

Author : Unknown Editor

Source : NIST website and the CRC Handbook of Chemistry and Physics

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