{
  "ANCILLARIES": {
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      "_note": "coefficients are in increasing order; input in K, output in J/mol; value is enthalpy minus hs_anchor enthalpy",
      "max_abs_error": 313.9350446757544,
      "max_abs_error_units": "J/mol",
      "type": "rational_polynomial"
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      "max_abs_error": 731.0648141534498,
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      "type": "rational_polynomial"
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    "melting_line": {
      "BibTeX": "Buecker-JPCRD-2006B",
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      "max_abs_error": 2.253246071558979,
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      "type": "rational_polynomial"
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      "description": "sigma = sum(a_i*(1-T/Tc)^n_i)",
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  "EOS": [
    {
      "BibTeX_CP0": "",
      "BibTeX_EOS": "Buecker-JPCRD-2006B",
      "STATES": {
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        "sat_min_liquid": {
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        "sat_min_vapor": {
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      "Ttriple": 134.895,
      "Ttriple_units": "K",
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        {
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          "type": "IdealGasHelmholtzEnthalpyEntropyOffset"
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        {
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          "type": "ResidualHelmholtzGaussian"
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      "critical_region_splines": {
        "T_max": 425.125,
        "T_min": 425.12491360192047,
        "_note": "Coefficients for the critical cubic spline.  T = c[0]*rho^3 + c[1]*rho^2 + c[2]*rho + c[3] with rho in mol/m^3 and T in K",
        "cL": [
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        "cV": [
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      "gas_constant_units": "J/mol/K",
      "molar_mass": 0.0581222,
      "molar_mass_units": "kg/mol",
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      "pseudo_pure": false
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  ],
  "INFO": {
    "2DPNG_URL": "http://www.chemspider.com/ImagesHandler.ashx?id=7555",
    "ALIASES": [
      "nButane",
      "butane",
      "Butane",
      "BUTANE",
      "N-BUTANE",
      "R600",
      "NC4H10",
      "n-C4H10"
    ],
    "CAS": "106-97-8",
    "CHEMSPIDER_ID": 7555,
    "ENVIRONMENTAL": {
      "ASHRAE34": "A3",
      "FH": 4,
      "GWP100": 3.0,
      "GWP20": -1.0,
      "GWP500": -1.0,
      "HH": 1,
      "Name": "n-Butane",
      "ODP": -1.0,
      "PH": 0
    },
    "FORMULA": "C_{4}H_{10}",
    "INCHI_KEY": "IJDNQMDRQITEOD-UHFFFAOYSA-N",
    "INCHI_STRING": "InChI=1S/C4H10/c1-3-4-2/h3-4H2,1-2H3",
    "NAME": "n-Butane",
    "REFPROP_NAME": "BUTANE",
    "SMILES": "CCCC"
  },
  "STATES": {
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      "hmolar": 40331.42740266437,
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      "rhomolar_units": "mol/m^3",
      "smolar": 137.34805198475811,
      "smolar_units": "J/mol/K"
    },
    "triple_liquid": {
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      "T_units": "K",
      "hmolar": -5220.749887455389,
      "hmolar_units": "J/mol",
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    "triple_vapor": {
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      "hmolar_units": "J/mol",
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      "rhomolar_units": "mol/m^3",
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  },
  "TRANSPORT": {
    "conductivity": {
      "BibTeX": "Perkins-JCED-2002-nButane",
      "critical": {
        "GAMMA": 0.0496,
        "R0": 1.03,
        "gamma": 1.239,
        "qD": 1142400182.0,
        "type": "simplified_Olchowy_Sengers",
        "zeta0": 1.94e-10
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      "dilute": {
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        "T_reducing_units": "K",
        "m": [
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        "n": [
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        "type": "ratio_of_polynomials"
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      "residual": {
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        "rhomass_reducing": 227.8,
        "rhomass_reducing_units": "kg/m^3",
        "t": [
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        "type": "polynomial"
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    },
    "viscosity": {
      "BibTeX": "Vogel-HTHP-1999",
      "dilute": {
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        "a": [
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        "molar_mass": 0.0581222,
        "molar_mass_units": "kg/mol",
        "t": [
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        "type": "collision_integral"
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      "epsilon_over_k": 280.51,
      "epsilon_over_k_units": "K",
      "higher_order": {
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        "d1": [
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        "f": [
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        "q": [
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        "rhomolar_reduce": 3920,
        "rhomolar_reduce_units": "mol/m^3",
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        "t2": [
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        "type": "modified_Batschinski_Hildebrand"
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      "initial_density": {
        "b": [
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        "t": [
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        "type": "Rainwater-Friend"
      },
      "sigma_eta": 5.7335e-10,
      "sigma_eta_units": "m"
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  }
}