Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Abstract hbar=e^2/e0c

  1. Jun 10, 2005 #1
    Abstract:
    hbar=e^2/e0c
    hbar=[1.6021765(31) x 10^-19 A-s]^2/[8.854187817... x 10^-12 A^2-s^4/kg-m^3-sr][2.99792458 x 10^8 m/s]
    hbar=[2.5669696(36) x 10^-38 A^2-s^2]/[2.6544187(29) x 10^-3 A^2-s^3/kg-m^2-sr]
    hbar=[9.6705527(59) x 10^-36 kg-m^2-sr/s]

    Introduction:
    Planck constant: h = 6.6260693(11) x 10^-34 kg-m^2/s
    speed of light in vacuum: c = 2.99792458 x 10^8 m/s
    Newtonian constant: G = 6.6723635(22) x 10^-11 m^3/kg-s^2
    Boltzmann constant: k = 1.3806504(11) x 10^-23 kg-m^2/s^2-K
    elementary charge: e = 1.6021765(31) x 10^-19 A-s
    electric constant: e0 = 8.854187817... x 10^-12 A^2-s^4/kg-m^3-sr
    molar mass: M = 3.2858629(47) x 10^19 kg/kmol
    dielectric constant: ke = 1.4594705(10) x 10^-2 sr
    fine-structure constant: a = 7.2973525(68) x 10^-3 rad

    Derivation:
    1) temperature: [(hc^5/G)^1/2]/k = 3.5518626(92) x 10^32 K
    2) electric current: e/[(hG/c^5)^1/2] = 1.1857531(48) x 10^24 A
    3) dielectric constant: e^2/(e0hc) = 1.4594705(14) x 10^-2 sr
    4) fine-structure constant: e^2/(2e0hc) = 7.2973525(68) x 10^-3 rad
    5) mass: (hc/G)^1/2 = 5.4563031(18) x 10^-8 kg
    6) amount of substance: [(hc/G)^1/2]/M = 1.6605388(62) x 10^-27 kmol
    7) length: (hG/c^3)^1/2 = 4.0507625(15) x 10^-35 m
    8) luminous intensity: [(hG/c^5)^1/2]/ke = 9.2580762(94) x 10^-42 cd
    9) time: (hG/c^5)^1/2 = 1.3511889(33) x 10^-43 s

    Conclusion:
    001) radiance = 1.5154964(57) x 10^123 kg/s^3-sr
    002) irradiance = 2.2118223(93) x 10^121 kg/s^3
    003) radiant density = 7.3778453(51) x 10^112 kg/m-s^2
    004) density = 1.5044912(03) x 10^103 /m^3
    005) mass density = 8.2089600(41) x 10^95 kg/m^3
    006) i. luminous efficacy = 2.6860106(85) x 10^95 kg-m^2/cd-sr-s^3
    007) electric current density = 7.2263787(71) x 10^92 A/m^2
    008) thermal transfer = 6.2272181(80) x 10^88 kg/s^3-K
    009) electric charge density = 2.4104604(96) x 10^84 A-s/m^3
    010) angular acceleration = 3.9969910(02) x 10^83 rad/s^2
    011) surface tension = 2.9885899(39) x 10^78 kg/s^2
    012) molar concentration = 2.4982661(10) x 10^76 kmol/m^3
    013) dynamic viscosity = 9.9688629(88) x 10^69 kg/m-s
    014) inverse area = 6.0943365(69) x 10^68 /m^2
    015) electric field strength = 7.5560138(75) x 10^62 kg-m/A-s^3
    016) surface density = 3.3252547(62) x 10^61 kg/m^2
    017) absorbed dose rate = 6.6515877(76) x 10^59 m^2/s^3
    018) magnetic field strength = 2.9272344(25) x 10^58 A/m
    019) thermal conductivity = 2.5224981(98) x 10^54 kg-m/s^3-K
    020) magnetic flux density = 2.5204149(31) x 10^54 kg/A-s^2
    021) radiant intensity = 2.4867291(78) x 10^54 kg-m^2/s^3-sr
    022) power = 3.6293079(12) x 10^52 kg-m^2/s^3
    023) field acceleration = 2.2187308(58) x 10^51 m/s^2
    024) electric flux density = 9.7642030(22) x 10^49 A-s/m^2
    025) force = 1.2106068(10) x 10^44 kg-m/s^2
    026) frequency = 7.4008895(10) x 10^42 /s
    027) surface concentration = 1.0119882(71) x 10^42 kmol/m^2
    028) inverse luminous intensity = 1.0801379(99) x 10^41 /cd
    029) angular velocity = 5.4006900(07) x 10^40 rad/s
    030) molar energy = 2.9531863(41) x 10^36 kg-m^2/s^2-kmol
    031) mass flow rate = 4.0381496(51) x 10^35 kg/s
    032) wave number = 2.4686710(13) x 10^34 /m
    033) temperature = 3.5518626(92) x 10^32 K
    034) electric conductivity = 9.5637447(08) x 10^29 A^2-s^3/kg-m^3
    035) electric potential = 3.0607617(77) x 10^28 kg-m^2/A-s^3
    036) luminance = 5.6421832(93) x 10^27 cd/m^2
    037) mass field = 1.3469817(34) x 10^27 kg/m
    038) Avogadro constant = 6.0221415(04) x 10^26 /kmol
    039) luminous flux density = 8.2346001(27) x 10^25 cd-sr/m^2
    040) electric current = 1.1857531(48) x 10^24 A
    041) thermal conductance = 1.0218041(14) x 10^20 kg-m^2/s^3-K
    042) magnetic potential = 1.0209602(33) x 10^20 kg-m/A-s^2
    043) molar mass = 3.2858629(47) x 10^19 kg/kmol
    044) displacement = 4.4930474(34) x 10^18 kg-s/m^2
    045) luminous density = 2.7467669(40) x 10^17 cd-sr-s/m^3
    046) absorbed dose = 8.987551787… x 10^16 m^2/s^2
    047) electric displacement = 3.9552467(59) x 10^15 A-s/m
    048) Josephson quantum = 4.8359787(85) x 10^14 A-s^2-sr/kg-m^2-rad
    049) Josephson constant = 2.4179893(93) x 10^14 A-s^2/kg-m^2
    050) Coulomb constant = 7.7384850(15) x 10^12 kg-m^3/A^2-s^4
    051) energy = 4.9038806(85) x 10^9 kg-m^2/s^2
    052) speed of light in vacuum = 2.99792458 x 10^8 m/s
    053) Faraday constant = 9.6485337(83) x 10^7 A-s/kmol
    054) inverse mass = 1.8327427(53) x 10^7 /kg
    055) von Klitzing constant = 2.5812807(51) x 10^4 kg-m^2/A^2-s^3
    056) i. conductance q. = 1.2906403(76) x 10^4 kg-m^2-rad/A^2-s^3-sr
    057) molar gas constant = 8.3144721(42) x 10^3 kg-m^2/s^2-kmol-K
    058) impedance of vacuum = 3.767303134… x 10^2 kg-m^2-sr/A^2-s^3
    059) inverse fine-structure constant = 1.3703599(91) x 10^2 /rad
    060) relative permeability = 6.8517999(54) x 10^1 /sr
    061) momentum = 1.6357585(24) x 10^1 kg-m/s
    062) spin two = 2.0000000 x 10^0 sr/rad
    063) spin one = 1.0000000 x 10^0 rad/rad, sr/sr
    064) spin one-half = 5.0000000 x 10^-1 rad/sr
    065) dielectric constant = 1.4594705(14) x 10^-2 sr
    066) second radiation = 1.4387752(25) x 10^-2 m-K
    067) fine-structure constant = 7.2973525(68) x 10^-3 rad
    068) magnetic permeability = 8.6102257(82) x 10^-5 kg-m/A^2-s^2
    069) conductance q. = 7.7480917(13) x 10^-5 A^2-s^3-sr/kg-m^2-rad
    070) electric conductance = 3.8740458(57) x 10^-5 A^2-s^3/kg-m^2
    071) magnetic constant = 1.256637061... x 10^-6 kg-m-sr/A^2-s^2
    072) molar Planck constant = 3.9903127(01) x 10^-7 kg-m^2/s-kmol
    073) mass = 5.4563031(18) x 10^-8 kg
    074) radiant distribution = 3.335640952... x 10^-9 s/m
    075) Stefan-Boltzmann constant = 1.3897144(61) x 10^-9 kg/s^3-K^4
    076) density of states = 2.0392013(27) x 10^-10 s^2/kg-m^2
    077) Newtonian constant = 6.6723635(22) x 10^-11 m^3/kg-s^2
    078) magnetic pole strength = 4.8032044(04) x 10^-11 A-m
    079) electric constant = 8.854187817... x 10^-12 A^2-s^4/kg-m^3-sr
    080) magnetic exposure = 2.9363774(27) x 10^-12 A-s/kg
    081) electric permittivity = 1.2922426(01) x 10^-13 A^2-s^4/kg-m^3
    082) magnetic flux = 4.1356674(39) x 10^-15 kg-m^2/A-s^2
    083) magnetic flux q. = 2.0678337(20) x 10^-15 kg-m^2-rad/A-s^2-sr
    084) specific heat = 2.5303770(36) x 10^-16 m^2/s^2-K
    085) first radiation = 1.1910428(22) x 10^-16 kg-m^4-sr/s^3-rad
    086) radiation = 5.9552141(09) x 10^-17 kg-m^4/s^3
    087) elementary charge = 1.6021765(31) x 10^-19 A-s
    088) molality = 3.0433405(66) x 10^-20 kmol/kg
    089) thermal resistance = 9.7866116(02) x 10^-21 s^3-K/kg-m^2
    090) Boltzmann constant = 1.3806504(11) x 10^-23 kg-m^2/s^2-K
    091) inverse electric current = 8.4334585(30) x 10^-25 /A
    092) kinematic viscosity = 1.2143880(51) x 10^-26 m^2/s
    093) amount of substance = 1.6605388(62) x 10^-27 kmol
    094) electric resistivity = 1.0456155(31) x 10^-30 kg-m^3/A^2-s^3
    095) relative expansion = 2.8154241(50) x 10^-33 /K
    096) Planck constant = 6.6260693(11) x 10^-34 kg-m^2/s
    097) length = 4.0507625(15) x 10^-35 m
    098) reduced Planck constant = 9.6705527(59) x 10^-36 kg-m^2-sr/s
    099) absorption-emission = 2.4763817(25) x 10^-36 s/kg
    100) inductance = 3.4877979(84) x 10^-39 kg-m^2/A^2-s^2
    101) luminous intensity = 9.2580762(94) x 10^-42 cd
    102) moment = 2.2102188(14) x 10^-42 kg-m
    103) luminous flux = 1.3511889(33) x 10^-43 cd-sr
    104) time = 1.3511889(33) x 10^-43 s
    105) magnetic moment = 1.9456640(35) x 10^-45 A-m^2
    106) capacitance = 5.234567901... x 10^-48 A^2-s^4/kg-m^2
    107) electric moment = 6.4900366(34) x 10^-54 A-s-m
    108) area = 1.6408676(95) x 10^-69 m^2
    109) fluidity = 1.0031234(27) x 10^-70 m-s/kg
    110) inertial moment = 8.9530715(22) x 10^-77 kg-m^2
    111) molar volume = 4.0027761(50) x 10^-77 m^3/kmol
    112) electric charge volume = 4.1485848(93) x 10^-85 m^3/A-s
    113) luminous energy = 1.8257115(33) x 10^-86 cd-sr-s
    114) electric current volume = 1.3838189(66) x 10^-93 m^2/A
    115) luminous efficacy = 3.7229933(79) x 10^-96 cd-sr-s^3/kg-m^2
    116) mass volume = 1.2181811(03) x 10^-96 m^3/kg
    117) volume = 6.6467653(52) x 10^-104 m^3
    118) radiant volume = 1.3554092(73) x 10^-113 m-s^2/kg
    119) inverse irradiance = 4.5211586(75) x 10^-122 s^3/kg
    120) inverse radiance = 6.5984977(75) x 10^-124 s^3-sr/kg

    Bibliography:
    http://physics.nist.gov/cuu/Constants/
     
  2. jcsd
  3. Jun 11, 2005 #2

    James R

    User Avatar
    Science Advisor
    Homework Helper
    Gold Member

    Err... no it doesn't.
     
  4. Jun 11, 2005 #3
    Rubbish. Off by two orders of magnitude!

    edit:
    [tex]\frac{e^2}{\epsilon_0 c}=9.668\times 10^{-36} \frac{C^2}{(F/m)(m/s)}=C\cdot V\cdot s=J\cdot s[/tex]

    [tex]\hbar=1.055*10^{-34} J\cdot s[/tex]
     
    Last edited by a moderator: Jun 11, 2005
  5. Jun 11, 2005 #4
    Planck constant, h, is a measured quantity, but hbar is not.

    According to NIST measured quantity h
    Planck constant: h = 6.6260693 x 10^-34 kg-m^2/s
    http://physics.nist.gov/cgi-bin/cuu/Value?h|search_for=universal_in!

    According to NIST theoretical quantity h/(2 pi)
    Planck constant/(2 pi): hbar = 1.05457168 x 10^-34 kg-m^2/s
    http://physics.nist.gov/cgi-bin/cuu/Value?hbar|search_for=universal_in!

    Accurate Measurement of the Planck Constant
    Edwin R. Williams, Richard L. Steiner, David B. Newell, and Paul T. Olsen
    Physical Review Letters 81 (22) 2404-2407 (1998)

    Planck constant, h, is a measured quantity, but hbar is not.

    NIST derivation quantity e^2/e0c
    e = 1.60217653 x 10^-19 A-s
    http://physics.nist.gov/cgi-bin/cuu/Value?e|search_for=elecmag_in!
    e0 = 8.854187817... x 10^-12 A^2-s^4/kg-m^3
    http://physics.nist.gov/cgi-bin/cuu/Value?hbar|search_for=universal_in!
    c = 299792458 m/s
    http://physics.nist.gov/cgi-bin/cuu/Value?c|search_for=universal_in!

    Solve: e^2/e0c = ?
    [(1.60217653 x 10^-19 A-s)^2]/(8.854187817... x 10^-12 A^2-s^4/kg-m^3)(299792458 m/s) = ?
    (2.566969633 x 10^-38 A^2-s^2)/(2.654418729... x 10^-3 A^2-s^3/kg-m^2) = ?
    9.670552746 x 10^-36 kg-m^2/s

    NIST theoretical quantity h/(2 pi)
    h = 6.6260693 x 10^-34 kg-m^2/s
    http://physics.nist.gov/cgi-bin/cuu/Value?h|search_for=universal_in!
    (2 pi) = 6.283185307
    http://physics.nist.gov/cgi-bin/cuu/Category?view=html&Universal.x=65&Universal.y=8

    Solve: h/(2 pi)
    (6.6260693 x 10^-34 kg-m^2/s)/(6.283185307)
    1.05457168 x 10^-34 kg-m^2/s

    Compare: hbar derivation / hbar theoretical
    9.670552746 x 10^-36 kg-m^2/s (hbar derivation)
    1.05457168 x 10^-34 kg-m^2/s (hbar theoretical)

    Garry Denke
     
  6. Jun 11, 2005 #5
    Don't quote unnecessary information.

    Look at your numbers:
    edit: emphasis added

    [tex]\hbar[/tex] is about [tex]10^{-34}J\cdot s[/tex]; [tex]\frac{e^2}{\epsilon_0 c}[/tex] is about [tex]10^{-36}J\cdot s[/tex]. The second is almost a hundred times bigger than the first; they are not equal.
     
    Last edited by a moderator: Jun 11, 2005
  7. Jun 11, 2005 #6
    That is the point rachmaninoff.

    e^2/e0c = hbar is a derivation,
    h/(2 pi) = hbar is only a theory.

    GarryDenke
     
  8. Jun 11, 2005 #7
    This looks TD-worthy.

    How did you think you derived it? (I'm just curious, it's obviously not correct).

    No, it's a definition.
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?



Similar Discussions: Abstract hbar=e^2/e0c
  1. E=mc^2 question (Replies: 7)

  2. About E=mc^2 (Replies: 5)

  3. Meaning of E=mc^2 (Replies: 5)

  4. Playing with E=MC^2 (Replies: 3)

  5. E=MC^2 Question (Replies: 2)

Loading...