Physical Constants

Physical Constants

Physical Constant	Symbol	Value
Atomic Mass Unit (Dalton)	amu	1.66056x10-27 kg
Mass of an Electron	me	9.10953x10-31 kg
Mass of an Electron	me	5.48580x10-4 amu
Mass of a Neutron	mn	1.67495x10-27 kg
Mass of a Neutron	mn	1.00866 amu
Mass of a Proton	mp	1.67265x10-27 kg
Mass of a Proton	mp	1.00728 amu
Charge of a Proton	e	1.6022x10-19 C
Bohr Radius	a0	5.292x10-11 m
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Physical Constant	Symbol	Value
Avogadro's Number	N or NA	6.022x1023/mol
Boltzmann's Constant	k or kB	1.381x10-23 J/K
Boltzmann's Constant	k or kB	3.298x10-24 cal/K
Electron Volt	eV	1.602x10-19 J
Electron Volt	eV	3.828x10-20 cal
Faraday Constant	F	9.6485x104 C/mol
Faraday Constant	F	2.306x104 cal/(volt equivalent)
Curie	Ci	3.70x1010 disintegrations/sec
Universal Gas Constant	R=NA kB	8.314 J/(mol K)
Universal Gas Constant	R=NA kB	1.987 cal/(mol K)
Universal Gas Constant	R=NA kB	0.08206 L atm/(mol K)
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Physical Constant	Symbol	Value
Planck's Constant	h	6.626x10-34 J s
Planck's Constant	h	1.584x10-34 cal s
Speed of Light in a Vacuum	c	2.997925x108 m/s
Permeability of Free Space	μ0	4πx10-7 T m/A
Permittivity of Free Space	ε0	8.854x10-12 C2/(N m2)
Coulomb Constant	k=1/(4πε0)	8.988x109 N m2/C2
Universal Gravitational Constant	G	6.673x10-11 N m2/kg2
Acceleration Due to Earth's Gravity	g	9.80 m/s2
Acceleration Due to Earth's Gravity	g	32.2 ft/s2
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