Physical Constants
Physical constants  SI Units.
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Description  Symbol  Formula  Value_{1}  Unit_{1}  Value_{2}  Unit_{2} 

Absolute zero, temperature  0  ^{o}K  273.15  ^{o}C  
Acceleration of gravity at earth's surface  g  9.81  m/s^{2}  32.2  ft/s^{2}  
Atmospheric pressure at sea level  1.013 25 *10^{5}  N/m^{2}  14.69  lb/in^{2}  
Atomic mass unit  1.660 540 *10^{27}  kg  1.000  u  
Avogadro's constant  N_{A}  6.022 141*10^{23}  mol^{1}  
Base of natural logaritms  e  2.718 281 828...  
Base of natural logaritms  lnx  2.3026 log x  
Bohr magneton  μ_{B}  e h/4πm_{e}  9.274 009 994 *10^{24}  Am^{2}  5.788 381 *10^{5}  eV/T 
Bohr radius  a_{0}  ε_{0}h^{2}/π m_{e}e^{2}  5.291 772 106 7* 10^{11}  m  2.08 *10^{9}  in 
Boltzmann constant  k  R/N_{A}  1.380 648 52 *10^{23}  J/K  8.617 330 *10^{5}  eV/K 
Charge of electron  e  1.602 176 *10^{19}  C  
Faraday constant  F  e N_{A}  9.6 485332 89 * 10^{4}  C/mol  26.801  Ah/mol 
Fine structure constant  α  7.297 20* 10^{3}  
Gas constant (molar, ideal)  R  8.314 459 8  J/molK  82.057 338  cm^{3}atm/molK  
Gravitational constant  G  6.674 08 *10^{11}  m^{3}/kg s^{2}  
Mass of electron (rest mass)  m_{e}  9.109 383 56 *10^{31}  kg  5.485 799*10^{4}  u  
Mass of neutron  m_{n}  1.674 927 47* 10^{27}  kg  1.008 664 915  u  
Mass of proton  m_{p}  1.672 621 90 *10^{27}  kg  1.007 276 466  u  
Permeability of a vacuum  μ_{0}  4p *10^{7}  kg m/s^{2}A^{2}  
Permittivity of a vacuum  ε_{0}  1/μ_{0 }c_{0}^{2}  8.854 187 817 *10^{12}  C^{2}/Nm^{2}  A^{2}s^{4}/kg m^{3}  
Planck's constant  h  6.626 070 040 * 10^{34}  J s  4.135 667 *10^{15}  eV s  
Radiation constant, first  C_{1}  2 π h c^{2}  3.741 844 *10^{16}  Wm^{2}  
Radiation constant, second  C_{2}  h c/k  1.438 833 *10^{2}  mK  
Ratio of a circle's circumference(C) to its diameter  π  C/d  3.141 592 653…  
Rydberg constant  R∞  m_{e}e^{4}/8ε_{0}^{2}h^{3}c_{0}  1.097 373 156 * 10^{7}  m^{1}  
Speed of light in vacuum  c_{0}  2.99 792 458 *10^{8}  m/s  
StefanBoltzmann constant  σ  5.670 367*10^{8}  W/m^{2}K^{4}  11.7 *10^{8}  cal/cm^{2}dayK^{4}  
Volume ideal gas, 1 atm, 0°C  V_{m}  22413.6  cm^{3}/mol  22.4136  liter/mol  
Volume ideal gas,1 atm, 25°C  V_{m}  24466.1  cm^{3}/mol  1.0244651  m^{3}/mol 
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