Useful Constants:

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Symbol

Value

Units

Atomic Mass

 

= 1.66054E-27

Kg

Avogadro constant

No

= 6.0225 E23

1/mol

Bohr Radius

ao

= 5.29177E-11

m

Boltzmann constant

k = R/No

= 1.381 E-23

J/K

= 8.6173E-5

ev / K

= 2.08366

1 / K s

Diracís constant

 

= 1.05457E-34

J s

= 6.58212E-16

ev s

Earth

Dist. From Moon

 

= 3.844E8

m

Magnetic Field

Bo

= 1.8E-5

T

Mass

 

= 5.972E24

Kg

Radius

 

= 6.37E6

m

Electron

Charge

e

= 1.6021 E-19

C

= 2.418E-14

A / J

Mass

me

= 9.1094E-31

Kg

Radius

re

= 2.8179E-15

m

Electric Permittivity

eo = 1/moco2

= 8.85419 E-12

F / m

Faraday constant

F = Noe

= 96,487

C / mol

Fermiís constant

 

= 1.4E-50

J / m3

Gas constant

R

= 0.08206

liter atm / mol K

= 0.08314

liter bar mol K

= 0.7302

ft3 atm / lbmol R

= 1.986

Btu / lbmol R

= 1.987

cal / mol K

= 8.314

J / mol K

= 10.73

ft3 psia / lbmol R

= 82.06

cm3 atm / mol K

= 1545

ft lbf / lbmol R

Gravity Acceleration

g

= 9.80665

m / s2

= 32.1740

ft / s2

Light

Speed

co

= 2.99793 E8

m/s

Year

 

= 9.46053E15

m

Magnetic Permeability

mo

= 4p E-7

H / m, N / A2

Neutron Mass

mn

= 1.67493E-27

Kg

Planck constant

h

= 6.6256 E-34

J s

= 4.13567E-15

ev s

Proton Mass

mp

= 1.67262158E-27

Kg

Stefan-Boltzman constant

s

= 5.6704E-8

Wm-2K-4

Sun

Radius

 

= 6.96E8

m

Solar constant

 

= 1400

W / m2