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 - C to D Cc | Dd 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 Cc   Name Symbol Value   Cahen's Constant 0.6294650204    Carbon-14 Half-life of T 5570 years   Catalan's Constant G 0.915965594  Chain ch 20.1168 m Characteristic Impedence of Vacuum Z0 376.730313461 Ω Charge to Mass Quotient, Electron -e/me -1.758820174(71) × 1011 C kg-1   Charge to Mass Quotient, Proton e/mp 9.57883408(38) × 107 C kg-1   Charge, Electron e e/h 1.602176462(63) × 10-19 C 2.417989491(95) × 1014 A J-1 Charge, Electron Specific -e/me -1.758819(62) × 1011 C kg-1   Charge, Elementary e e/h 1.602176462(63) × 10-19 C 2.417989491(95) × 1014 A J-1 Circulation, Quantum of h/2me h/me 3.636947516(27) × 10-4 m2 s-1 7.273895032(53) × 10-4 m2 s-1   Classical Electron Radius re 2.817940285(31) × 10-15 m Common Logarithm of 2 log10 2 0.30102999566398119521    Compton Wavelength of Electron λc 2.426310215(18) × 10-12 m Compton Wavelength, Muon λC,µ 11.73444197(35) × 10-15 m Compton Wavelength, Neutron h/mnc λC,n 1.319590898(10) × 10-15 m Compton Wavelength, Proton h/mpc λC,p 1.321409847(10) × 10-15 m Compton Wavelength, Tau λC,τ 0.69770(11) × 10-15 m Conductance Quantum 2e2/h G0 7.748091696(28) × 10-5 S   Conductance, Quantized Hall e2/h 3.87404614 × 10-5 S   Constant, Absolute Entropy S0/R -1.1517048(44)  -1.1648678(44)  Constant, Apéry's ζ(3) 1.202056903  Constant, Boltzmann k 1.3806503(24) × 10-23 J K-1 8.617342(15) × 10-5 eV K-1 2.0836644(36) × 1010 Hz K-1 Constant, Catalan's G 0.915965594  Constant, Dirac's ħ (h bar) 1.054571596(82) × 10-34 J s 6.58211889(26) × 10-16 eV s Constant, Electric (1/µ0c2) ε0 8.854187817 × 10-12 F m-1   Constant, Euler's γ C 0.57721566490153286061  Constant, Faraday F 96485.3415(39) C mol-1 Constant, Feigenbaum's δ 4.669210609102990  Constant, Fermi 1.4 × 10-50 J m-3 Constant, Fermi Coupling GF/(ħc)3 1.16639(1) × 10-5 GeV-2   Constant, Fine Structure α 7.297352533(27) × 10-3  Constant, First Radiation 2πhc2 c1 3.74177107(29) × 10-16 W m2   Constant, Gas R 8.314 J K-1 mol-1   Constant, Gravitational G 6.673(10) × 10-11 N m2 kg-2   Constant, Inverse Fine Structure α 137.03599976(50) × 10-3    Constant, Khintchine's K 2.685452001  Constant, Loschmidt n0 2.6867775(47) × 1025 m-3   Constant, Loschmidt (T=273.15K, p=100kPa) Vm 22.710981(40) × 10-3 m3 mol-1   Constant, Magnetic µ0 4π × 10-7 N A-2 12.566370614 × 10-7 N A-2   Constant, Planck (h) h 6.62606876(52) × 10-34 J s 4.13566727(16) × 10-15 eV s   Constant, Pythagoras' 1.4142135624  Constant, Sackur-Tetrode S0/R -1.1517048(44)  -1.1648678(44)  Constant, Solar 1400 W m-2   Constant, Stefan-Boltzmann (π2/60)k4/ħ3c2 σ 5.670400(40) × 10-8 W m-2 K-4   Constant, Verdet's (Light at 589nm in water) 0.000477 rad A-1   Constant, von Klitzing RK 25812.807572(95) Ω   Constant, Wien Displacement Law b 2.8977686(51) × 10-3 m K   Constants, Planck (h/2π) ħ (h bar) 1.054571596(82) × 10-34 J s 6.58211889(26) × 10-16 eV s   Constants, Rydberg α2mec/2h R∞ R∞c R∞hc 10973731.568549(83) m-1 3.289841960368(25) × 1015 Hz 2.17987190(17) × 10-18 J   Copper, Linear Expansivity of α 1.7 × 10-5 K-1   Copper, Specific Heat Capacity of cc 385 J kg-1 K-1   Copper, Thermal Conductivity of kc 385 W m-1 K-1   Copper, Young Modulus for Ec 1.3 × 1011 Pa   Cord (Timber) cd (UK) 3.624556364 m3 Critical Temperature of Air -190 °C 183 K Cross Section, Thomson σe 0.665245854(15) × 10-28 m2   Cube Foot ft3 cu. ft. 2.8316846592 × 10-2 m3 1728 in3   Cube Inch in3 cu. in. 1.6387064 × 10-5 m3   Cube Yard yd3 cu. yd. 7.64554858 × 10-5 m3 27 ft3 46656 in3   Curie Ci 3.7 × 1010 Bq Cc | Dd 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 Dd   Name Symbol Value   Dalton amu mu u 1.66053873(13) × 10-27 kg 931.494013(37) MeV 1.49241778(12) × 10-10 J Daniel Cell, emf of 1.08 V   Density of Air (at stp) 0.7734 m3 kg-1 1.2929 kg m-3   Density, Earth's Average 5.517 × 103 kg m-3   Deuteron Magnetic Moment µd 0.43307375(15) × 10-26 J T-1 0.4669754479 × 10-3 µB 0.857438230(24) µN   Deuteron Molar Mass Md 2.013553214(24) u   Deuteron Rest Mass md 3.3435860(20) × 10-27 kg 2.013553214(24) u 1875.61339(57) MeV c-2   Deuteron-Electron Magnetic Moment Ratio µd/µe 0.4664345460(91) × 10-3    Deuteron-Electron Rest Mass Ratio md/me 3670.483014(75)    Deuteron-Proton Magnetic Moment Ratio µd/µp 0.3070122035(51)    Deuteron-Proton Rest Mass Ratio md/mp 1.999007496(6)    Dirac's Constant ħ (h bar) 1.054571596(82) × 10-34 J s 6.58211889(26) × 10-16 eV s Drachm (Avoirdupois) dr (avdp.) dr. (av.) 1.771845195 × 10-3 kg 0.00390625 lb 0.0625 oz   Dram (Avoirdupois) dr (avdp.) dr. (av.) 1.771845195 × 10-3 kg 0.00390625 lb 0.0625 oz   Dry Pint (US) pt (US, dry) 5.50610469 × 10-4 m3 Cc | Dd 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