Symbols, Units, Constants & Conversions
 

Conversions      SI  Metric Units      Greek A;phabet

Multiples & Submultiples of Units       Derived Quantities

Scientific Constants

 
Constant
Symbol
Value
Unit
Speed of Light (meters)
c
299774 / 3 x 106
km/s / m/s
Speed of Light (miles)
-
186271 
miles/s
Permitivity
îO
~ 1/36p x 10-9 
F/m
Permeability
mO
4p x 10-9 
H/m
Intrinsic impedance
h
~ 120p or 377(ê)
 
Planck's constant
h
6.626176 x 10-34
J.S
Boltzmann constant
k
1.380662 x 10-23
J.K
Gravitational constant
G
6.672 x 10-11
Nm2 kg
Accelaration of free fall
g
9.80665
ms
Atomic mass unit
u
1.6605655 x 10-23
kg
Rest mass of electron
me
9.107 x 10-31 
(kg)
Charge of electron
-e
-1.602 x 10-19 
(C)
Charge to-mass ratio of electron
-e/me
-1.759 x 1011 
(C/kg)
Radius of electron
Re
2.81 x 10-15 
(m)
Rest mass of proton
mp
1.673 x 10-27 
(kg)

 

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Compiled by D. Brewer - April 2000