Science
Constants - C to D

Cc | Dd
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Cc
  Name Symbol Value  
General Mathematical Constants Cahen's Constant 0.6294650204 
 
Carbon-14 Half-life of T 5570 years
 
General Mathematical Constants Catalan's Constant G 0.915965594 
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Units of Length Chain ch 20.1168 m
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Universal Constants Characteristic Impedence of Vacuum Z0 376.730313461 Ω
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Electron Particle Constants Charge to Mass Quotient, Electron -e/me -1.758820174(71) × 1011 C kg-1
 
Proton Particle Constants Charge to Mass Quotient, Proton e/mp 9.57883408(38) × 107 C kg-1
 
Electron Particle Constants Charge, Electron e
e/h
1.602176462(63) × 10-19 C
2.417989491(95) × 1014 A J-1
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Electron Particle Constants Charge, Electron Specific -e/me -1.758819(62) × 1011 C kg-1
 
Electromagnetic Constants Charge, Elementary e
e/h
1.602176462(63) × 10-19 C
2.417989491(95) × 1014 A J-1
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General Atomic and Nuclear Constants Circulation, Quantum of h/2me
h/me
3.636947516(27) × 10-4 m2 s-1
7.273895032(53) × 10-4 m2 s-1
 
Electron Particle Constants Classical Electron Radius re 2.817940285(31) × 10-15 m
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General Mathematical Constants Common Logarithm of 2 log10 2 0.30102999566398119521 
 
Electron Particle Constants Compton Wavelength of Electron λc 2.426310215(18) × 10-12 m
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Muon Particle Constants Compton Wavelength, Muon λC,µ 11.73444197(35) × 10-15 m
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Neutron Particle Constants Compton Wavelength, Neutron h/mnc λC,n 1.319590898(10) × 10-15 m
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Proton Particle Constants Compton Wavelength, Proton h/mpc λC,p 1.321409847(10) × 10-15 m
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Tau Particle Constants Compton Wavelength, Tau λC,τ 0.69770(11) × 10-15 m
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Electromagnetic Constants Conductance Quantum 2e2/h G0 7.748091696(28) × 10-5 S
 
Conductance, Quantized Hall e2/h 3.87404614 × 10-5 S
 
Physico-Chemical Constants Constant, Absolute Entropy S0/R -1.1517048(44) 
-1.1648678(44) 
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General Mathematical Constants Constant, Apéry's ζ(3) 1.202056903 
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Physico-Chemical Constants 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
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General Mathematical Constants Constant, Catalan's G 0.915965594 
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Universal Constants Constant, Dirac's ħ
(h bar)
1.054571596(82) × 10-34 J s
6.58211889(26) × 10-16 eV s
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Universal Constants Constant, Electric (1/µ0c2) ε0 8.854187817 × 10-12 F m-1
 
General Mathematical Constants Constant, Euler's γ
C
0.57721566490153286061 
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Physico-Chemical Constants Constant, Faraday F 96485.3415(39) C mol-1
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General Mathematical Constants Constant, Feigenbaum's δ 4.669210609102990 
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Universal Constants Constant, Fermi 1.4 × 10-50 J m-3
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Electroweak Constants Constant, Fermi Coupling GF/(ħc)3 1.16639(1) × 10-5 GeV-2
 
General Atomic and Nuclear Constants Constant, Fine Structure α 7.297352533(27) × 10-3 
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Physico-Chemical Constants Constant, First Radiation 2πhc2 c1 3.74177107(29) × 10-16 W m2
 
Constant, Gas R 8.314 J K-1 mol-1
 
Gravitational Constants Constant, Gravitational G 6.673(10) × 10-11 N m2 kg-2
 
General Atomic and Nuclear Constants Constant, Inverse Fine Structure α 137.03599976(50) × 10-3 
 
General Mathematical Constants Constant, Khintchine's K 2.685452001 
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Physico-Chemical Constants Constant, Loschmidt n0 2.6867775(47) × 1025 m-3
 
Physico-Chemical Constants Constant, Loschmidt (T=273.15K, p=100kPa) Vm 22.710981(40) × 10-3 m3 mol-1
 
Universal Constants Constant, Magnetic µ0 4π × 10-7 N A-2
12.566370614 × 10-7 N A-2
 
Universal Constants Constant, Planck (h) h 6.62606876(52) × 10-34 J s
4.13566727(16) × 10-15 eV s
 
General Mathematical Constants Constant, Pythagoras' 1.4142135624 
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Physico-Chemical Constants Constant, Sackur-Tetrode S0/R -1.1517048(44) 
-1.1648678(44) 
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Astronomical Values Constant, Solar 1400 W m-2
 
Physico-Chemical Constants Constant, Stefan-Boltzmann (π2/60)k43c2 σ 5.670400(40) × 10-8 W m-2 K-4
 
Constant, Verdet's (Light at 589nm in water) 0.000477 rad A-1
 
Electromagnetic Constants Constant, von Klitzing RK 25812.807572(95) Ω
 
Physico-Chemical Constants Constant, Wien Displacement Law b 2.8977686(51) × 10-3 m K
 
Universal Constants Constants, Planck (h/2π) ħ
(h bar)
1.054571596(82) × 10-34 J s
6.58211889(26) × 10-16 eV s
 
General Atomic and Nuclear Constants Constants, Rydberg α2mec/2h R
Rc
Rhc
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
 
Units of Volume Cord (Timber) cd (UK) 3.624556364 m3
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Critical Temperature of Air -190 °C
183 K
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Electron Particle Constants Cross Section, Thomson σe 0.665245854(15) × 10-28 m2
 
Units of Volume Cube Foot ft3
cu. ft.
2.8316846592 × 10-2 m3
1728 in3
 
Units of Volume Cube Inch in3
cu. in.
1.6387064 × 10-5 m3
 
Units of Volume Cube Yard yd3
cu. yd.
7.64554858 × 10-5 m3
27 ft3
46656 in3
 
Curie Ci 3.7 × 1010 Bq
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Cc | Dd
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Dd
  Name Symbol Value  
Physico-Chemical Constants Dalton amu
mu
u
1.66053873(13) × 10-27 kg
931.494013(37) MeV
1.49241778(12) × 10-10 J
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Electricity Constants Daniel Cell, emf of 1.08 V
 
Density of Air (at stp) 0.7734 m3 kg-1
1.2929 kg m-3
 
Astronomical Values Density, Earth's Average 5.517 × 103 kg m-3
 
Deuteron Particle Constants Deuteron Magnetic Moment µd 0.43307375(15) × 10-26 J T-1
0.4669754479 × 10-3 µB
0.857438230(24) µN
 
Deuteron Particle Constants Deuteron Molar Mass Md 2.013553214(24) u
 
Deuteron Particle Constants Deuteron Rest Mass md 3.3435860(20) × 10-27 kg
2.013553214(24) u
1875.61339(57) MeV c-2
 
Deuteron Particle Constants Deuteron-Electron Magnetic Moment Ratio µde 0.4664345460(91) × 10-3 
 
Deuteron Particle Constants Deuteron-Electron Rest Mass Ratio md/me 3670.483014(75) 
 
Deuteron Particle Constants Deuteron-Proton Magnetic Moment Ratio µdp 0.3070122035(51) 
 
Deuteron Particle Constants Deuteron-Proton Rest Mass Ratio md/mp 1.999007496(6) 
 
Universal Constants Dirac's Constant ħ
(h bar)
1.054571596(82) × 10-34 J s
6.58211889(26) × 10-16 eV s
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Units of Mass Drachm (Avoirdupois) dr (avdp.)
dr. (av.)
1.771845195 × 10-3 kg
0.00390625 lb
0.0625 oz
 
Units of Mass Dram (Avoirdupois) dr (avdp.)
dr. (av.)
1.771845195 × 10-3 kg
0.00390625 lb
0.0625 oz
 
Units of Volume Dry Pint (US) pt (US, dry) 5.50610469 × 10-4 m3
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Page compiled: Wed Sep 05 18:37:52 GMT+01:00 2001