Science
Constants - A to B

Aa | Bb
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Aa
  Name Symbol Value  
Physico-Chemical Constants Absolute Entropy Constant S0/R -1.1517048(44) 
-1.1648678(44) 
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Absolute Zero -273.15 ° C
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Gravitational Constants Acceleration of Free Fall on Earth g 9.80665 m s-2
32.1740 ft s-2
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Units of Area Acre 4046.85642240 m2
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Air, Critical Temperature of -190 °C
183 K
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Air, Density of 0.7734 m3 kg-1
1.2929 kg m-3
  
Air, Viscosity of (20°C) η0 1.8 × 10-5 N s m-2
  
General Mathematical Constants Alladi-Grinstead Constant 0.809394020534 
  
Electromagnetic Constants Ångström Å 10-10 m
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Units of Length Année-lumière ly 9.46052973 × 1015 m
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General Mathematical Constants Apéry's Constant ζ(3) 1.202056903 
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Units of Mass Apothecaries' Ounce oz (apoth)
oz (ap.)		 3.110347680 × 10-2 kg
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General Mathematical Constants Archimedes' Constant π 3.1415926535897932384626433832795 
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Units of Length Astronomical Unit AU 1.4959787 × 1011 m
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Atmospheric Pressure 1.01325 × 105 N m-2
1.01325 bar
14.7 lbf in-2
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Physico-Chemical Constants Atomic Mass Unit amu
mu
u		 1.66053873(13) × 10-27 kg
931.494013(37) MeV
1.49241778(12) × 10-10 J
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Physico-Chemical Constants Avogadro Constant NA 6.02214199(47) × 1023 mol-1
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Units of Mass Avoirdupois Ounce oz avdp
oz (av.)
oz		 2.834952313 × 10-2 kg
0.0625 lb (av.)
16 drachms (av.)
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Bb
  Name Symbol Value  
General Mathematical Constants Backhouse's Constant 1.45607494858268967139959535111654356 
  
General Mathematical Constants Base of Natural Logarithms e 2.7182818284590452353602874713526 
  
General Mathematical Constants Bernstein's Constant β 0.2801694990 
  
Units of Volume Board Foot (Timber) fbm 2.359737216 × 10-3 m3
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Electromagnetic Constants Bohr Magneton µB 9.27400899(37) × 10-24 J T-1
5.788381749(43) × 10-5 eV T-1
1.399624624(56) × 1010 Hz T-1
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General Atomic and Nuclear Constants Bohr Radius a0 5.291772083(19) × 10-11 m
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Physico-Chemical Constants Boltzmann Constant k 1.3806503(24) × 10-23 J K-1
8.617342(15) × 10-5 eV K-1
2.0836644(36) × 1010 Hz K-1
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General Mathematical Constants Briggsian (common) logarithm of 2 log10 2 0.30102999566398119521 
  
General Mathematical Constants Brun's Constant B 1.9021605824 
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Page compiled: Wed Sep 05 18:37:52 GMT+01:00 2001