Sponsored by the Institute of Physics   Constants   A to B   C to D   E to F   G to I   J to L   M   N to Q   R to T   U to Z Equations Periodic Table Conversions Java Structurer SI Units Symbols   Printer Version Science Constants - A to B Aa | Bb A to B | C to D | E to F | G to I | J to L | M | N to Q | R to T | U to Z Aa   Name Symbol Value   Absolute Entropy Constant S0/R -1.1517048(44)  -1.1648678(44)  Absolute Zero -273.15 ° C Acceleration of Free Fall on Earth g 9.80665 m s-2 32.1740 ft s-2 Acre 4046.85642240 m2 Air, Critical Temperature of -190 °C 183 K 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   Alladi-Grinstead Constant 0.809394020534    Ångström Å 10-10 m Année-lumière ly 9.46052973 × 1015 m Apéry's Constant ζ(3) 1.202056903  Apothecaries' Ounce oz (apoth) oz (ap.) 3.110347680 × 10-2 kg Archimedes' Constant π 3.1415926535897932384626433832795  Astronomical Unit AU 1.4959787 × 1011 m Atmospheric Pressure 1.01325 × 105 N m-2 1.01325 bar 14.7 lbf in-2 Atomic Mass Unit amu mu u 1.66053873(13) × 10-27 kg 931.494013(37) MeV 1.49241778(12) × 10-10 J Avogadro Constant NA 6.02214199(47) × 1023 mol-1 Avoirdupois Ounce oz avdp oz (av.) oz 2.834952313 × 10-2 kg 0.0625 lb (av.) 16 drachms (av.) Aa | Bb To the top | To the bottom A to B | C to D | E to F | G to I | J to L | M | N to Q | R to T | U to Z Bb   Name Symbol Value   Backhouse's Constant 1.45607494858268967139959535111654356    Base of Natural Logarithms e 2.7182818284590452353602874713526    Bernstein's Constant β 0.2801694990    Board Foot (Timber) fbm 2.359737216 × 10-3 m3 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 Bohr Radius a0 5.291772083(19) × 10-11 m 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 Briggsian (common) logarithm of 2 log10 2 0.30102999566398119521    Brun's Constant B 1.9021605824  Aa | Bb To the top | To the bottom A to B | C to D | E to F | G to I | J to L | M | N to Q | R to T | U to Z   [ H O M E ] [ S C I E N C E ] [ M A T H S ] [ A S T R O N O M Y ] Download | Shop | Contact | About   Page compiled: Wed Sep 05 18:37:52 GMT+01:00 2001