Constants Used in Physics, Chemistry and Engineering
Some of the most important and frequently used constants in physics such as the speed of light, Plank's constant, Earth acceleration and mass, etc ... are listed below.
Definition  Value 
Mass of Earth 
m _{E} = 5.98 × 10^{24} Kg

(mean) Radius of Earth 
r _{E} = 6.4 × 10^{6} m


Mass of Moon 
m _{M} = 7.36 × 10^{22} Kg


(mean) Radius of Moon 
r _{M} = 1.74 × 10^{6} m


Mass of Sun 
m _{s} = 1.99 × 10^{30} Kg


(mean) Radius of Sun 
r _{s} = 6.96 × 10^{8} m


Acceleration due to Earth Gravity (near surface of Earth) 
g = 9.8 m/s^{2}


Speed of Light in Vacuum 
c = 3.00 × 10^{8} m/s


Gravitational Constant (appears in Newton's law of universal gravitation) 
G = 6.67 × 10^{11} N·m^{2} / kg^{2}

Permeability in Vacuum 
μ_{0} = 4π × 10^{7} T·m / A

Permittivity in Vacuum 
ε_{0} = 8.854 × 10^{12} F / m

Coulomb's Constant (in Coulomb's Law) 
k = 9.00 × 10^{9} N·m^{2}/C^{2}


Planck's constant h 
h = 6.63 × 10^{34} J·s


Elementary Charge e 
e = 1.60 × 10^{19} C


Mass of Electron 
m_{e} = 9.109 × 10^{31} Kg

Mass of Proton 
m_{p} = 1.673 × 10^{27} Kg

Mass of Neutron 
m_{n} = 1.675 ×10^{27} Kg
