{
  "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": 312.5893026211961,
      "max_abs_error_units": "J/mol",
      "type": "rational_polynomial"
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      "max_abs_error": 724.7717509068489,
      "max_abs_error_units": "J/mol",
      "type": "rational_polynomial"
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    "melting_line": {
      "BibTeX": "Buecker-JPCRD-2006B",
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      "description": "p'' = pc*exp(Tc/T*sum(n_i*theta^t_i))",
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      "using_tau_r": true
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      "max_abs_error": 2.640692800404784,
      "max_abs_error_units": "J/mol/K",
      "type": "rational_polynomial"
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      "BibTeX": "Mulero-JPCRD-2012",
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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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      "T_max_units": "K",
      "Ttriple": 113.73,
      "Ttriple_units": "K",
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          "type": "IdealGasHelmholtzEnthalpyEntropyOffset"
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        {
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          "type": "ResidualHelmholtzGaussian"
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      "critical_region_splines": {
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        "T_min": 407.75175593000233,
        "_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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      "gas_constant": 8.314472,
      "gas_constant_units": "J/mol/K",
      "molar_mass": 0.0581222,
      "molar_mass_units": "kg/mol",
      "p_max": 35000000,
      "p_max_units": "Pa",
      "pseudo_pure": false
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  ],
  "INFO": {
    "2DPNG_URL": "http://www.chemspider.com/ImagesHandler.ashx?id=6120",
    "ALIASES": [
      "isobutane",
      "Isobutane",
      "ISOBUTANE",
      "R600A",
      "R600a",
      "ISOBUTAN"
    ],
    "CAS": "75-28-5",
    "CHEMSPIDER_ID": 6120,
    "ENVIRONMENTAL": {
      "ASHRAE34": "UNKNOWN",
      "FH": 4,
      "GWP100": -1.0,
      "GWP20": -1.0,
      "GWP500": -1.0,
      "HH": 1,
      "Name": "IsoButane",
      "ODP": -1.0,
      "PH": 0
    },
    "FORMULA": "C_{4}H_{10}",
    "INCHI_KEY": "NNPPMTNAJDCUHE-UHFFFAOYSA-N",
    "INCHI_STRING": "InChI=1S/C4H10/c1-4(2)3/h4H,1-3H3",
    "NAME": "IsoButane",
    "REFPROP_NAME": "ISOBUTAN",
    "SMILES": "CC(C)C"
  },
  "STATES": {
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      "hmolar": 36847.01527077499,
      "hmolar_units": "J/mol",
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    "triple_liquid": {
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      "hmolar_units": "J/mol",
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    "triple_vapor": {
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      "hmolar": 21407.563324517243,
      "hmolar_units": "J/mol",
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      "rhomolar": 2.4207430192010477e-05,
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      "smolar_units": "J/mol/K"
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  },
  "TRANSPORT": {
    "conductivity": {
      "BibTeX": "Perkins-JCED-2002-Isobutane",
      "critical": {
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        "R0": 1.03,
        "gamma": 1.239,
        "qD": 1520540217.5,
        "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": 224.4,
        "rhomass_reducing_units": "kg/m^3",
        "t": [
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        "type": "polynomial"
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    },
    "viscosity": {
      "BibTeX": "Vogel-IJT-2000",
      "dilute": {
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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": 307.55,
      "epsilon_over_k_units": "K",
      "higher_order": {
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        "h": [
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        "p": [
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        "rhomolar_reduce": 3860,
        "rhomolar_reduce_units": "mol/m^3",
        "t1": [
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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": 4.6445e-10,
      "sigma_eta_units": "m"
    }
  }
}