{
  "ALIASES": [
    "nButane", 
    "butane", 
    "BUTANE", 
    "N-BUTANE"
  ], 
  "ANCILLARIES": {
    "hL": {
      "A": [
        -65886.41597851239, 
        194.0320081006785, 
        0.7618406833394283, 
        -0.007238621356846148, 
        2.9755426506520465e-05, 
        -7.011782613907154e-08, 
        8.837069342009507e-11, 
        -4.707537920400538e-14
      ], 
      "B": [
        1, 
        -0.0023293055572433954
      ], 
      "Tmax": 425.025, 
      "Tmin": 134.895, 
      "_note": "coefficients are in increasing order; input in K, output in J/mol; value is enthalpy minus hs_anchor enthalpy", 
      "max_abs_error": 314.0391481339266, 
      "max_abs_error_units": "J/mol", 
      "type": "rational_polynomial"
    }, 
    "hLV": {
      "A": [
        30829.39902734273, 
        35.26287922211559, 
        -2.2704609326224827, 
        0.01756157612833266, 
        -7.263584595127676e-05, 
        1.7187285471377152e-07, 
        -2.1985442762409518e-10, 
        1.1914363248919687e-13
      ], 
      "B": [
        1, 
        -0.002326410836443862
      ], 
      "Tmax": 425.025, 
      "Tmin": 134.895, 
      "_note": "coefficients are in increasing order; input in K, output in J/mol; value is enthalpy minus hs_anchor enthalpy", 
      "max_abs_error": 731.8147350107515, 
      "max_abs_error_units": "J/mol", 
      "type": "rational_polynomial"
    }, 
    "melting_line": {
      "BibTeX": "Buecker-JPCRD-2006B", 
      "T_m": 135.23, 
      "parts": [
        {
          "T_0": 134.895, 
          "T_max": 163.9, 
          "T_min": 134.895, 
          "a": [
            558558236.4
          ], 
          "p_0": 0.653, 
          "t": [
            2.206
          ]
        }
      ], 
      "type": "polynomial_in_Tr"
    }, 
    "pL": {
      "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, 
      "n": [
        -5.805352213973263, 
        -11.51448089471748, 
        18.238781113551752, 
        -7.570052478022171, 
        -1.4755071099444654, 
        -1.328641564172384
      ], 
      "reducing_value": 3796000.0, 
      "t": [
        0.978, 
        1.371, 
        1.499, 
        1.748, 
        4.108, 
        4.752
      ], 
      "type": "pL", 
      "using_tau_r": true
    }, 
    "pV": {
      "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": 0.02366371569104686, 
      "n": [
        0.06986482880463143, 
        -6.689091326409199, 
        4.774874567188075, 
        -5.7054710938841655, 
        1.8437119133933968, 
        -3.735372218319482
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      "reducing_value": 3796000.0, 
      "t": [
        0.743, 
        0.984, 
        1.886, 
        2.16, 
        3.286, 
        4.231
      ], 
      "type": "pV", 
      "using_tau_r": true
    }, 
    "rhoL": {
      "T_r": 425.125, 
      "Tmax": 425.124999999999, 
      "Tmin": 134.895, 
      "description": "rho' = rhoc*(1+sum(n_i*theta^t_i))", 
      "max_abserror_percentage": 0.21170510433432543, 
      "n": [
        7.6544950329552, 
        -16.928503641708495, 
        14.176327512939299, 
        -2.3511736019127136, 
        5.431931351600508, 
        -13.286388570143172
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      "reducing_value": 3922.7696129878086, 
      "t": [
        0.501, 
        0.742, 
        0.917, 
        1.387, 
        9.328, 
        12.623
      ], 
      "type": "rhoLnoexp", 
      "using_tau_r": false
    }, 
    "rhoV": {
      "T_r": 425.125, 
      "Tmax": 425.124999999999, 
      "Tmin": 134.895, 
      "description": "rho'' = rhoc*exp(Tc/T*sum(n_i*theta^t_i))", 
      "max_abserror_percentage": 1.1838723681035446, 
      "n": [
        -3.756767939636941, 
        -2.819084986331516, 
        2.3817493893256763, 
        -27.835034497609627, 
        409.95394459399324, 
        -539.2138907428523
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      "reducing_value": 3922.7696129878086, 
      "t": [
        0.448, 
        1.717, 
        4.443, 
        7.472, 
        13.095, 
        14.725
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      "type": "rhoV", 
      "using_tau_r": true
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    "sL": {
      "A": [
        -394.4518793046988, 
        3.7459785836920694, 
        -0.020681359554898613, 
        8.03582482625795e-05, 
        -2.0496683506579566e-07, 
        3.2044071783328733e-10, 
        -2.783738518903021e-13, 
        1.0119459735951263e-16
      ], 
      "B": [
        1, 
        -0.002327232686316588
      ], 
      "Tmax": 425.025, 
      "Tmin": 134.895, 
      "_note": "coefficients are in increasing order; input in K, output in J/mol/K; value is entropy minus hs_anchor entropy", 
      "max_abs_error": 0.7816684690278102, 
      "max_abs_error_units": "J/mol/K", 
      "type": "rational_polynomial"
    }, 
    "sLV": {
      "A": [
        1077.4527890640188, 
        -17.32971202096554, 
        0.13927215986633712, 
        -0.0006744492928162153, 
        2.03727132123387e-06, 
        -3.7623477704667074e-09, 
        3.890974502452121e-12, 
        -1.725666636216928e-15
      ], 
      "B": [
        1, 
        -0.0023087652909098734
      ], 
      "Tmax": 425.025, 
      "Tmin": 134.895, 
      "_note": "coefficients are in increasing order; input in K, output in J/mol/K; value is entropy minus hs_anchor entropy", 
      "max_abs_error": 2.255712442154347, 
      "max_abs_error_units": "J/mol/K", 
      "type": "rational_polynomial"
    }, 
    "surface_tension": {
      "BibTeX": "Mulero-JPCRD-2012", 
      "Tc": 425.125, 
      "a": [
        0.05138
      ], 
      "description": "sigma = sum(a_i*(1-T/Tc)^n_i)", 
      "n": [
        1.209
      ]
    }
  }, 
  "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", 
      "STATES": {
        "hs_anchor": {
          "T": 467.63750000000005, 
          "T_units": "K", 
          "hmolar": 47861.671413925265, 
          "hmolar_units": "J/mol", 
          "p": 6189994.4837319525, 
          "p_units": "Pa", 
          "rhomolar": 3530.492651689028, 
          "rhomolar_units": "mol/m^3", 
          "smolar": 152.79309067928807, 
          "smolar_units": "J/mol/K"
        }, 
        "reducing": {
          "T": 425.125, 
          "T_units": "K", 
          "hmolar": 40337.78928854941, 
          "hmolar_units": "J/mol", 
          "p": 3796000, 
          "p_units": "Pa", 
          "rhomolar": 3922.769612987809, 
          "rhomolar_units": "mol/m^3", 
          "smolar": 137.36140769025366, 
          "smolar_units": "J/mol/K"
        }, 
        "sat_min_liquid": {
          "T": 134.895, 
          "T_units": "K", 
          "hmolar": -5220.749887455425, 
          "hmolar_units": "J/mol", 
          "p": 0.6656573875403293, 
          "p_units": "Pa", 
          "rhomolar": 12645.062133275143, 
          "rhomolar_units": "mol/m^3", 
          "smolar": -27.033334124053827, 
          "smolar_units": "J/mol/K"
        }, 
        "sat_min_vapor": {
          "T": 134.895, 
          "T_units": "K", 
          "hmolar": 23603.753385951088, 
          "hmolar_units": "J/mol", 
          "p": 0.6656588871711283, 
          "p_units": "Pa", 
          "rhomolar": 0.0005935026998216393, 
          "rhomolar_units": "mol/m^3", 
          "smolar": 186.64770129910008, 
          "smolar_units": "J/mol/K"
        }
      }, 
      "T_max": 340, 
      "T_max_units": "K", 
      "Ttriple": 134.895, 
      "Ttriple_units": "K", 
      "accentric": 0.200810094644, 
      "accentric_units": "-", 
      "alpha0": [
        {
          "a1": 12.54882924, 
          "a2": -5.46976878, 
          "type": "IdealGasHelmholtzLead"
        }, 
        {
          "a": 3.24680487, 
          "type": "IdealGasHelmholtzLogTau"
        }, 
        {
          "n": [
            5.54913289, 
            11.4648996, 
            7.59987584, 
            9.66033239
          ], 
          "t": [
            0.774840445, 
            3.340602552, 
            4.970513096, 
            9.975553778
          ], 
          "type": "IdealGasHelmholtzPlanckEinstein"
        }, 
        {
          "a1": -17.9737888338978, 
          "a2": 10.3892639083242, 
          "reference": "IIR", 
          "type": "IdealGasHelmholtzEnthalpyEntropyOffset"
        }
      ], 
      "alphar": [
        {
          "d": [
            1, 
            1, 
            1, 
            2, 
            3, 
            4, 
            4, 
            1, 
            1, 
            2, 
            7, 
            8, 
            8, 
            1, 
            2, 
            3, 
            3, 
            4, 
            5, 
            5, 
            10, 
            2, 
            6
          ], 
          "l": [
            0, 
            0, 
            0, 
            0, 
            0, 
            0, 
            0, 
            1, 
            1, 
            1, 
            1, 
            1, 
            1, 
            2, 
            2, 
            2, 
            2, 
            2, 
            2, 
            2, 
            2, 
            3, 
            3
          ], 
          "n": [
            2.5536998241635, 
            -4.4585951806696, 
            0.82425886369063, 
            0.11215007011442, 
            -0.035910933680333, 
            0.016790508518103, 
            0.032734072508724, 
            0.95571232982005, 
            -1.0003385753419, 
            0.085581548803855, 
            -0.025147918369616, 
            -0.0015202958578918, 
            0.004706068232642, 
            -0.097845414174006, 
            -0.04831790415876, 
            0.17841271865468, 
            0.018173836739334, 
            -0.11399068074953, 
            0.019329896666669, 
            0.001157587740101, 
            0.00015253808698116, 
            -0.043688558458471, 
            -0.0082403190629989
          ], 
          "t": [
            0.5, 
            1, 
            1.5, 
            0, 
            0.5, 
            0.5, 
            0.75, 
            2, 
            2.5, 
            2.5, 
            1.5, 
            1, 
            1.5, 
            4, 
            7, 
            3, 
            7, 
            3, 
            1, 
            6, 
            0, 
            6, 
            13
          ], 
          "type": "ResidualHelmholtzPower"
        }, 
        {
          "beta": [
            150, 
            200
          ], 
          "d": [
            1, 
            2
          ], 
          "epsilon": [
            0.85, 
            1
          ], 
          "eta": [
            10, 
            10
          ], 
          "gamma": [
            1.16, 
            1.13
          ], 
          "n": [
            -0.028390056949441, 
            0.0014904666224681
          ], 
          "t": [
            2, 
            0
          ], 
          "type": "ResidualHelmholtzGaussian"
        }
      ], 
      "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": [
          0.0, 
          0.0, 
          -5.692661766826853e-06, 
          425.1473310005959
        ], 
        "cV": [
          0.0, 
          0.0, 
          8.526909313167263e-06, 
          425.0915508992536
        ], 
        "rhomolar_max": 3937.946709931644, 
        "rhomolar_min": 3912.637210218117
      }, 
      "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
    }
  ], 
  "NAME": "n-Butane", 
  "REFPROP_NAME": "BUTANE", 
  "STATES": {
    "critical": {
      "T": 425.125, 
      "T_units": "K", 
      "p": 3796000.0, 
      "p_units": "Pa", 
      "rhomolar": 3922.7696129878086, 
      "rhomolar_units": "mol/m^3"
    }, 
    "triple_liquid": {
      "T": 134.895, 
      "T_units": "K", 
      "hmolar": -5220.749887455425, 
      "hmolar_units": "J/mol", 
      "p": 0.6656573875403293, 
      "p_units": "Pa", 
      "rhomolar": 12645.062133275143, 
      "rhomolar_units": "mol/m^3", 
      "smolar": -27.033334124053827, 
      "smolar_units": "J/mol/K"
    }, 
    "triple_vapor": {
      "T": 134.895, 
      "T_units": "K", 
      "hmolar": 23603.753385951088, 
      "hmolar_units": "J/mol", 
      "p": 0.6656588871711283, 
      "p_units": "Pa", 
      "rhomolar": 0.0005935026998216393, 
      "rhomolar_units": "mol/m^3", 
      "smolar": 186.64770129910008, 
      "smolar_units": "J/mol/K"
    }
  }, 
  "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
      }, 
      "dilute": {
        "A": [
          0.00162676, 
          0.000975703, 
          0.0289887
        ], 
        "B": [
          1.0
        ], 
        "T_reducing": 425.16, 
        "T_reducing_units": "K", 
        "m": [
          0
        ], 
        "n": [
          0, 
          1, 
          2
        ], 
        "type": "ratio_of_polynomials"
      }, 
      "residual": {
        "B": [
          -0.0304337, 
          0.16582, 
          -0.148144, 
          0.05255, 
          -0.00629367, 
          0.0418357, 
          -0.147163, 
          0.133542, 
          -0.0485489, 
          0.00644307
        ], 
        "T_reducing": 425.16, 
        "T_reducing_units": "K", 
        "d": [
          1, 
          2, 
          3, 
          4, 
          5, 
          1, 
          2, 
          3, 
          4, 
          5
        ], 
        "rhomass_reducing": 227.8, 
        "rhomass_reducing_units": "kg/m^3", 
        "t": [
          0, 
          0, 
          0, 
          0, 
          0, 
          -1, 
          -1, 
          -1, 
          -1, 
          -1
        ], 
        "type": "polynomial"
      }
    }, 
    "viscosity": {
      "BibTeX": "Vogel-HTHP-1999", 
      "dilute": {
        "C": 2.1357e-08, 
        "a": [
          0.17067154, 
          -0.48879666, 
          0.039038856
        ], 
        "molar_mass": 0.0581222, 
        "molar_mass_units": "kg/mol", 
        "t": [
          0, 
          1, 
          2
        ], 
        "type": "collision_integral"
      }, 
      "epsilon_over_k": 280.51, 
      "epsilon_over_k_units": "K", 
      "higher_order": {
        "T_reduce": 425.125, 
        "T_reduce_units": "K", 
        "a": [
          -5.47737770846e-05, 
          5.80898623034e-05, 
          3.52658446259e-05, 
          -3.96682203832e-05, 
          -1.83729542151e-06, 
          0.0, 
          -8.33262985358e-07, 
          1.93837020663e-06
        ], 
        "d1": [
          2, 
          2, 
          3, 
          3, 
          4, 
          4, 
          5, 
          5
        ], 
        "d2": [
          1
        ], 
        "f": [
          0.000188075903903
        ], 
        "g": [
          2.30873963359, 
          2.0340403725423957
        ], 
        "gamma": [
          0, 
          0, 
          0, 
          0, 
          0, 
          0, 
          0, 
          0
        ], 
        "h": [
          0, 
          -0.5
        ], 
        "l": [
          1, 
          1, 
          1, 
          1, 
          1, 
          1, 
          1, 
          1
        ], 
        "p": [
          1
        ], 
        "q": [
          0
        ], 
        "rhomolar_reduce": 3920, 
        "rhomolar_reduce_units": "mol/m^3", 
        "t1": [
          0, 
          1, 
          0, 
          1, 
          0, 
          1, 
          0, 
          1
        ], 
        "t2": [
          0
        ], 
        "type": "modified_Batschinski_Hildebrand"
      }, 
      "initial_density": {
        "b": [
          -19.572881, 
          219.73999, 
          -1015.3226, 
          2471.01251, 
          -3375.1717, 
          2491.6597, 
          -787.26086, 
          14.085455, 
          -0.34664158
        ], 
        "t": [
          0, 
          -0.25, 
          -0.5, 
          -0.75, 
          -1.0, 
          -1.25, 
          -1.5, 
          -2.5, 
          -5.5
        ], 
        "type": "Rainwater-Friend"
      }, 
      "sigma_eta": 5.7335e-10, 
      "sigma_eta_units": "m"
    }
  }
}