{
  "ALIASES": [
    "isobutane", 
    "Isobutane", 
    "ISOBUTANE", 
    "R600A", 
    "R600a"
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      "Tmax": 407.81699999999915, 
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      "description": "p' = pc*exp(Tc/T*sum(n_i*theta^t_i))", 
      "max_abserror_percentage": 0.025709437298837567, 
      "n": [
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      "reducing_value": 3629000.0, 
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        3.825, 
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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": 0.019699846909193575, 
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      "type": "pV", 
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      "Tmax": 407.81699999999915, 
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      "description": "rho' = rhoc*(1+sum(n_i*theta^t_i))", 
      "max_abserror_percentage": 0.26628224832738745, 
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      "type": "rhoLnoexp", 
      "using_tau_r": false
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      "Tmax": 407.81699999999915, 
      "Tmin": 113.73000000000002, 
      "description": "rho'' = rhoc*exp(Tc/T*sum(n_i*theta^t_i))", 
      "max_abserror_percentage": 0.4922366156330571, 
      "n": [
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      "type": "rhoV", 
      "using_tau_r": true
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    "surface_tension": {
      "BibTeX": "Mulero-JPCRD-2012", 
      "Tc": 407.81, 
      "a": [
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        0.06121
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      "description": "sigma = sum(a_i*(1-T/Tc)^n_i)", 
      "n": [
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        1.304
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    }
  }, 
  "CAS": "75-28-5", 
  "CRITICAL": {
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    "T_units": "K", 
    "p": 3629000.0, 
    "p_units": "Pa", 
    "rhomolar": 3879.756788283995, 
    "rhomolar_units": "mol/m^3"
  }, 
  "ENVIRONMENTAL": {
    "ASHRAE34": "UNKNOWN", 
    "FH": 4, 
    "GWP100": -1.0, 
    "GWP20": -1.0, 
    "GWP500": -1.0, 
    "HH": 1, 
    "Name": "IsoButane", 
    "ODP": -1.0, 
    "PH": 0
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  "EOS": [
    {
      "BibTeX_CP0": "", 
      "BibTeX_EOS": "Buecker-JPCRD-2006B", 
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      "T_max_units": "K", 
      "Ttriple": 113.73, 
      "Ttriple_units": "K", 
      "accentric": 0.183531783208, 
      "accentric_units": "-", 
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        {
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        {
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            9.73918122
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          "type": "IdealGasHelmholtzPlanckEinstein"
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          "type": "ResidualHelmholtzPower"
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        {
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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": 35000000, 
      "p_max_units": "Pa", 
      "pseudo_pure": false, 
      "ptriple": 0.02287944697, 
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      "reducing_state": {
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        "p": 3629000, 
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        "rhomolar": 3879.756788283995, 
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      "rhoLtriple": 12737.63993166686, 
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      "rhoVtriple": 2.420164552028876e-05, 
      "rhoVtriple_units": "mol/m^3"
    }
  ], 
  "NAME": "IsoButane", 
  "REFPROP_NAME": "ISOBUTAN", 
  "TRANSPORT": {
    "conductivity": {
      "BibTeX": "Perkins-JCED-2002-Isobutane", 
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        "R0": 1.03, 
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      "dilute": {
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        "B": [
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        "T_reducing": 407.82, 
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        "m": [
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        "type": "ratio_of_polynomials"
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      "residual": {
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        "rhomass_reducing": 225.5, 
        "rhomass_reducing_units": "kg/m^3", 
        "t": [
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        "type": "polynomial"
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    "viscosity": {
      "BibTeX": "Vogel-IJT-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": 307.55, 
      "epsilon_over_k_units": "K", 
      "higher_order": {
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        "a": [
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        "d2": [
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        "f": [
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        "g": [
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        "gamma": [
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        "h": [
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        "l": [
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        "p": [
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        "q": [
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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": {
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        "t": [
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        "type": "Rainwater-Friend"
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      "sigma_eta": 4.6445e-10, 
      "sigma_eta_units": "m"
    }
  }
}