Constants

Table of Constants

Constant	Symbol	Approximate Value	Units
Speed of light	c	[math]\displaystyle{ 3 \times 10^8 }[/math]	[math]\displaystyle{ m/s }[/math]
Gravitational Constant	G	[math]\displaystyle{ 6.7 \times 10^{-11} }[/math]	[math]\displaystyle{ N \cdot m^2 / kg^2 }[/math]
Electron Mass	m_e	[math]\displaystyle{ 9 \times 10^{-31} }[/math]	[math]\displaystyle{ kg }[/math]
Proton Mass	m_p	[math]\displaystyle{ 1.7 \times 10^{-27} }[/math]	[math]\displaystyle{ kg }[/math]
Neutron Mass	m_n	[math]\displaystyle{ 1.7 \times 10^{-27} }[/math]	[math]\displaystyle{ kg }[/math]
Electric Constant	[math]\displaystyle{ \frac{1}{4\pi\epsilon_0} }[/math]	[math]\displaystyle{ 9 \times 10^9 }[/math]	[math]\displaystyle{ N \cdot m^2 / C^2 }[/math]
Permitivity of Free Space	[math]\displaystyle{ \epsilon_0 }[/math]	[math]\displaystyle{ 8.85 \times 10^{-12} }[/math]	[math]\displaystyle{ (N \cdot m^2 / C^2)^{-1} }[/math]
Magnetic Constant	[math]\displaystyle{ \frac{\mu_0}{4\pi} }[/math]	[math]\displaystyle{ 1 \times 10^{-7} }[/math]	[math]\displaystyle{ T\cdot m/A }[/math]
Vacuum Permeability	[math]\displaystyle{ \mu_0 }[/math]	[math]\displaystyle{ 4\pi \times 10^{-7} }[/math]	[math]\displaystyle{ T\cdot m/A }[/math]
Proton Charge	[math]\displaystyle{ e }[/math]	[math]\displaystyle{ 1.6 \times 10^{-19} }[/math]	[math]\displaystyle{ C }[/math]
Electron Volt	[math]\displaystyle{ eV }[/math]	[math]\displaystyle{ 1.6 \times 10^{-19} }[/math]	[math]\displaystyle{ J }[/math]
Avogadro's Number	[math]\displaystyle{ N_A }[/math]	[math]\displaystyle{ 6.02 \times 10^{23} }[/math]	[math]\displaystyle{ molecules/mole }[/math]
Atomic Radius (approximate)	[math]\displaystyle{ R_a }[/math]	[math]\displaystyle{ 1 \times 10^{-10} }[/math]	[math]\displaystyle{ m }[/math]
Proton Radius	[math]\displaystyle{ R_p }[/math]	[math]\displaystyle{ 1 \times 10^{-15} }[/math]	[math]\displaystyle{ m }[/math]
E to ionize air	[math]\displaystyle{ E_{ionize} }[/math]	[math]\displaystyle{ 3 \times 10^{6} }[/math]	[math]\displaystyle{ V/m }[/math]
Earth's Magnetic Field	[math]\displaystyle{ B_{Earth} }[/math]	[math]\displaystyle{ 2 \times 10^{-5} }[/math]	[math]\displaystyle{ T }[/math]

--Spennell3 (talk) 14:57, 19 October 2015 (EDT)