{
  "ALIASES": [
    "nButane", 
    "butane", 
    "BUTANE", 
    "N-BUTANE"
  ], 
  "ANCILLARIES": {
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      "T_r": 425.125, 
      "Tmax": 425.124999999999, 
      "Tmin": 134.895, 
      "description": "p' = pc*exp(Tc/T*sum(n_i*theta^t_i))", 
      "max_abserror_percentage": 0.02500890020828983, 
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      "type": "pL", 
      "using_tau_r": true
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      "description": "p'' = pc*exp(Tc/T*sum(n_i*theta^t_i))", 
      "max_abserror_percentage": 0.02366371569104686, 
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      "Tmax": 425.124999999999, 
      "Tmin": 134.895, 
      "description": "rho' = rhoc*(1+sum(n_i*theta^t_i))", 
      "max_abserror_percentage": 0.21170510433432543, 
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      "type": "rhoLnoexp", 
      "using_tau_r": false
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    "rhoV": {
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      "Tmax": 425.124999999999, 
      "Tmin": 134.895, 
      "description": "rho'' = rhoc*exp(Tc/T*sum(n_i*theta^t_i))", 
      "max_abserror_percentage": 1.1838723681035446, 
      "n": [
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      "type": "rhoV", 
      "using_tau_r": true
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    "surface_tension": {
      "BibTeX": "Mulero-JPCRD-2012", 
      "Tc": 425.125, 
      "a": [
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      "description": "sigma = sum(a_i*(1-T/Tc)^n_i)", 
      "n": [
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  }, 
  "CAS": "106-97-8", 
  "ENVIRONMENTAL": {
    "ASHRAE34": "A3", 
    "FH": 4, 
    "GWP100": 3.0, 
    "GWP20": -1.0, 
    "GWP500": -1.0, 
    "HH": 1, 
    "Name": "n-Butane", 
    "ODP": -1.0, 
    "PH": 0
  }, 
  "EOS": [
    {
      "BibTeX_CP0": "", 
      "BibTeX_EOS": "Buecker-JPCRD-2006B", 
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      "T_max_units": "K", 
      "Ttriple": 134.895, 
      "Ttriple_units": "K", 
      "accentric": 0.200810094644, 
      "accentric_units": "-", 
      "alpha0": [
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        {
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          "type": "IdealGasHelmholtzLogTau"
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            4.970513096, 
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      "alphar": [
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        {
          "beta": [
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          "d": [
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          "epsilon": [
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          "eta": [
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          "gamma": [
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          "n": [
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          "type": "ResidualHelmholtzGaussian"
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      "gas_constant": 8.314472, 
      "gas_constant_units": "J/mol/K", 
      "molar_mass": 0.0581222, 
      "molar_mass_units": "kg/mol", 
      "p_max": 12000000, 
      "p_max_units": "Pa", 
      "pseudo_pure": false, 
      "ptriple": 0.6656588872, 
      "ptriple_units": "Pa", 
      "reducing_state": {
        "T": 425.125, 
        "T_units": "K", 
        "p": 3796000, 
        "p_units": "Pa", 
        "rhomolar": 3922.769612987809, 
        "rhomolar_units": "mol/m^3"
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      "rhoLtriple": 12645.04606150976, 
      "rhoLtriple_units": "mol/m^3", 
      "rhoVtriple": 0.0005936113826349512, 
      "rhoVtriple_units": "mol/m^3"
    }
  ], 
  "NAME": "n-Butane"
}