NESS ENGINEERING
TECHNICAL DATA
FUNDAMENTAL CONSTANTS

Quantity

Symbol

Value

SI Units

Cgs Units

Velocity of light

c

2.9979250

108 m/sec

1010 cm/sec

Free space permittivity

eo

8.8541

10-12 F / m

10-14 F / cm

Free space permeability

mo

1.2566

10-6 H / m

10-8 H / cm

Fine-structure constant

a

7.297351

10-3

10-3

Electron charge

e

1.6021917

10-19 C

10-20 emu

Planck's constant

h

6.626196

10-34 J-sec

10-27 erg-sec

Avogadro's number

N

6.022169

1026 kmole-1

1023 mole-1

Atomic mass unit

amu

1.660531

10-27 kg

10-24 gm

Electron rest mass

me

9.109558

10-31 kg

10-28 gm

Proton rest mass

Mp

1.672614

10-27 kg

10-24 gm

Neutron rest mass

Mn

1.674920

10-27 kg

10-24 gm

Proton / electron mass ratio

Mp / me

1836.109

 

 

Electron charge / mass ratio

e / me

1.7588028

1011 C / kg

107 emu / gm

Faraday constant

F

9.648670

107 C / kmole

103 emu / mole

Rydberg constant

R¥

1.09737312

107 m-1

105 cm-1

Boltzman constant

K

1.3807

10-23 J / K

10-16 erg / K

Stefan-Boltzman constant

s

5.671

10-8 W / m2 K4

10-5 W / cm2 K4

Gravitational constant

g

9.8067

kg m / s2

105 gm cm / s2

Loschmidt constant

no

2.6868

1025 m-3

1019 cm-3

Bohr radius

ao

5.2917715

10-11 m

10-9 cm

Classical electron radius

ro

2.817939

10-15 m

10-13 cm

Standard atmosphere

atm

 

1.0132 x 105 Pa

1.0125 x 106 erg / cm3


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Ness Engineering, Inc.
P.O. Box 261501
San Diego, CA 92196
(858) 566-2372
(858) 240-2299 FAX

Richard M. Ness and Ness Engineering, Inc.
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