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Physical Constants

Speed of light in vacuum c 3 X 108 ms-1
Gravitational constant G 6.67 X 10-11 Nm2Kg-2
Elementary charge e 1.6 X 10-19 C
Rest mass of electron me 9.11 X 10-31 kg
Rest mass of proton mp 1.007276 amu
Rest mass of neutron mn 1.008665 amu
Charge to mass ratio of an electron e / m 1.76 X 1011 kg-1
Permittivity  constant Єo 8.85 X 10-11 Fm-1
Permeability constant µo 4 π X 10-7 Hm-1
Planck constant h 6.625 X 10-34 Js
Universal gas constant R 8.31 J mol-1 k-1
Avogadro constant NA 6.02 X 1023 mol-1
Boltzmann constant k 1.38 X 10-23 J k-1
Stefan constant δ 5.67 X 10-8 W m-2 k-4
Wien constant b 2.9 X 10-3 mk
Faraday constant F 9.65 X 104 C mol-1
Rydbeg constant R 1.097 X 107 m-1
Bohr radius ro 5.29 X 10-11 m
Standard  atmosphericpressure atm 1.01 X 105 Nm-2
Density of water   1000 kg m-3
Density of air at STP   1.293 X 103 kg m-3
Density of mercury   13.6 X 103 kg m-3
 

 

Astronomical constants

Mass of sun = 1.99 X 1030 Kg

Radius of sun = 6.95 X 108 m

Mass of the earth = 5.98 X 1024 Kg

Mean radius of earth = 6.37 X 106 m

Mass of the moon = 7.36 X 1022 Kg

Radius of the moon = 1.74 X 106 m

Mean earth-sun distance = 1.50 X 1011 days

Mean earth-moon distance = 3.84 X 108 m

Escape velocity from the earth = 11.2 Kms-1 

Escape velocity from the moon = 2.36 Kms-1 

Solar constant = 1.340 Wm-2 

 

 

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