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Science

Constants - E to F


Ee
 |  Ff
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

  Ee  
    Name Symbol Value  
  e e e 2.7182818284590452353602874713526  
           
  Earth's Average Density Earth's Average Density   5.517 × 103  kg m −3  
           
  Earth's Average Radius Earth's Average Radius R 6.37 × 106 m  
           
  Earth's Magnetic Field, Horizontal Component of Earth's Magnetic Field, Horizontal Component of B0

1.8 × 10 −5 T

 
           
  Earth's Mass Earth's Mass M 5.972 × 10 24 kg  
           
  Earth-Moon Mean Distance Earth-Moon Mean Distance   3.844 × 10 8 m  
           
  Effective Temperature of the sun Effective temperature of the Sun   5780 K  
           
  Electric Constant (1/micro of 0 c to the power of 2) Electric Constant (1/µ0 c 2 ) εp 8.854187817 × 10 −12  F m −1
 
           
  Electric Constant Permittivity of free space Electric Constant Permittivity of
free space
ε0 8.854 187 817 × 10 −12  F m −1
 
           
  Electrical Power Specification (UK) Electrical Power Specification (UK)   230V ac, 50Hz  
           
  Electrical Power SPecification (US) Electrical Power Specification (US)   115V ac, 60Hz  
           
  Electron Charge Electron Charge e 1.602 176 462 ± 0.000000063 × 1019 C  
      e/h 2.417 989 491 ± 0.000 000 095 × 10 14 A J−1  
           
  Electron Charge to Mass Quotient Electron Charge to Mass Quotient −e/me −1.758 820 174 ± 0.000 000 071 × 10 11  C kg −1  
           
  Electron g-factor or Lande g-factor Electron g-factor
Landé g-factor
ge −2.002 319 304 3737 ± 0.000 000 000 0082  
           
  Electron Gyromagnetic Ratio Electron Gyromagnetic Ratio γe 1.760 859 794 ± 0.000 000 071 × 10 11  s −1  T −1  
      γe/2π 28024.954 0 ± 0.001 1 MHz T −1  
           
  Electron Magnetic Moment Electron Magnetic Moment μe −928.476 362 ± 0.000037 × 10 −26 J T −1  
           
  Electron Magnetic Moment Anomaly Electron Magnetic Moment Anomaly ae 1.159 652 1883 ± 0.000 000 0042 × 10 −3  
           
  Electron Mass Electron Mass me 9.109 381 88 ± 0.000 000 72× 10 −31 kg  
        5.485 799 110 ± 0.000 000 0 12 × 10−4 u  
        8.187 104 14 ± 0.000 000 64 × 10−14 J/ c2  
        0.510 998 902 ± 0.00 000 021 MeV/c2  
           
  Electron Molar Mass Electron Molar Mass M(e) 5.485799110 ± 0.000000012 × 10−7 kg mol−1  
      Me    
           
  Electron Radius, Classical Electron Radius, Classical re 2.817940285 ± 0.000000031 × 10 −15 m  
           
  Electron Specific Charge Electron Specific Charge −e/me −1.758819 ± 0.000062 × 10 11 C kg−1  
           
  Electron to Shielded Helion Magnetic Moment Ratio (gas, sphere, 25 degrees C Electron to Shielded Helion Magnetic Moment Ratio (gas, sphere, 25°C) μe/μ'h

864.058 255 ± 0.000 010

 
           
  Electron to Shielded Proton Magnetic Moment Ratio (H (of 2) 0, sphere, 25 degrees C) Electron to Shielded Proton Magnetic Moment Ratio (H2O, sphere, 25°C) μe/μ'b

−658.227 5954 ± 0.000 0071  
           
  Electron-alpha-Particle Mass Ratio Electron-α-Particle Mass Ratio me/mα 1.3709335611 ± 0.000000029 × 10 −4  
           
  Electron-Deuteron Magnetic Moment Ratio Electron-Deuteron Magnetic Moment Ratio μed −2143.923 498 ± 0.000 023  
           
  Electron-deuteron Mass Ratio Electron-Deuteron Mass Ratio me/md 2.724 437 1170 ± 0.0000000058 × 10 −4  
           
  Electron-Muon Magnetic Moment Ratio Electron-Muon Magnetic Moment Ratio μeμ 206.766 9720 ± 0.000 0063  
           
  Electron-Muon Mass ratio Electron-Muon Mass Ratio me/mμ 4.836 332 10 ±0.000 000 15 × 10 −3  
           
  Electron-Neutron Magnetic Moment Ratio Electron-Neutron Magnetic Moment Ratio μen 960.920 50 ± 0.000 23  
           
  Electron-Neutron Mass Ratio Electron-Neutron Mass Ratio me/mn 5.438 673 462 ± 0.000 000 012 × 10 −4  
           
  Electron-Proton Magnetic Moment ratio Electron-Proton Magnetic Moment Ratio μep −658.210 6875 ± 0.000 0066  
           
  Electron-Proton Mass Ratio Electron-Proton Mass Ratio me/mp 5.446 170 232 ± 0.000 000 012 × 10 −4  
           
  Electron-Tau Mass ratio Electron-Tau Mass Ratio me/mτ 2.875 55 ± 0.000 47 × 10 −4  
           
    Electronvolt eV 1.602 177 33 × 10 −19 J  
           
    Electronvolts, Million MeV 1.6 × 10 −13 J  
           
  Elementary Charge Elementary Charge e 1.602 176 462 ± 0.000 000 63 × 10−19 C  
      e/h 2.417 989 491 ± 0.000 000 095 × 10 14 A J −1  
           
  emf of Daniell cell emf of Daniell Cell   1.08 V  
           
  emf of Lechlanche Cell emf of Lechlanché Cell   1.46 V  
           
  emf of Nife Cell emf of Nife Cell   1.40 V  
           
  EMF of Weston standard cell EMF of Weston standard cell   1.018 636 V at 20°C  
           
  Energy Production, Sun's Energy Production, Sun's   3.90 × 10 26 W  
           
  Energy, Hartree Energy, Hartree Eh 4.359 743 81 ± 0.000 000 34 × 10−18 J
 
        27.211 3834 ± 0.000 0011 eV  
           
  Engineer's chain Engineer's chain   100 ft
30.48 m
 
           
    Enthalpy of vapourisation of Water   43.990 × 103 J mol−1 at 25°C  
           
  erg Erg erg 10−7 J  
           
  Euler's Constant Euler's Constant γ 0.57721566490153286061  
      C    
     
 
 
 
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  Ff  
    Name Symbol Value  
           
  Face Cord Face Cord   64 ft3
0.5 cord
1.812 278 181 888 m3
 
           
  Faraday Constant Faraday Constant F 96485.3415 ± 0.0039 C mol −1  
           
  Fathom Fathom   2 yd
1.8288 m
 
           
  Feigenbaum's Constant Feigenbaum's Constant σ 4.669210609102990  
           
  Fermi Fermi   10−15m  
           
  Fermi's Constant Fermi's Constant GF/(ħc)3 1.166 39 ± 0.000 01× 10−5 GeV−2  
           
  Fine Structure Constant Fine Structure Constant α 7.297 352 533 ± 0.000 000 027 × 10 −3  
       
 
  First Radiation Constant First Radiation Constant c1 3.741 771 07 ± 0.000 000 29 × 10 −16 W m 2  
           
  First Radiation Constant for Spectral Radiance 2hc to the power of 2 First Radiation Constant for Spectral Radiance 2hc 2 c1L 1.191 042 722 ± 0.000 000 093 × 10 −16 W m 2 sr−1  
           
  fl dr Fluid dram, UK fl dr 0.125 fl oz
3.551 631 25 × 10−6m3
 
           
  Fluid dram, US Fluid dram, US fl dr 0.125 fl oz (US)
3.696 6875 × 10−6m3
 
           
  Fluid Ounce, UK Fluid Ounce, UK fl oz 0.05 pint
2.841 305 × 10 −5 m 3
 
           
  fl oz Fluid Ounce, US fl oz 0.006 25 lq pt
2.957 35 × 10−5m3
 
           
  ft Foot ft 12 in
0.3048 m
 
           
  Foot, Board (Timber) Foot, Board (Timber) fbm 144 in3
2.359 737 216 × 10-3 m3
 
           
  Foot, cube Foot, cube ft3 2.8316846592 × 10 −2 m 3  
      cu. ft. 1728 in 3
 
           
  Francen-Robinson Constant Fransén-Robinson Constant   2.8077702420  
           
    Free Neutron, Half-life of T 650 s
 
           
  Free Space, Permeability of Free Space, Permeability of μ0 4π × 10 −7 N A −2
 
        12.566370614 × 10 −7 N A −2  
           
  Free Space, Permittivity of Free Space, Permittivity of ε0 8.854187817 × 10 −12 F m −1  
           
  Furlong Furlong ft 220 yd
201.168 m
 
           
 
 
 
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