{
  "ALIASES": [
    "helium", 
    "HELIUM", 
    "He"
  ], 
  "ANCILLARIES": {
    "hL": {
      "A": [
        -431.38320408055574, 
        638.5830895390288, 
        -489.7782289369555, 
        215.11564551032293, 
        -56.455544148624895, 
        8.839500777665124, 
        -0.7643756414392752, 
        0.02809650240174938
      ], 
      "B": [
        1, 
        -0.18438981201451518
      ], 
      "_note": "coefficients are in increasing order; input in K, output in J/mol; value is enthalpy minus hs_anchor enthalpy", 
      "max_abs_error": 0.022150387883478118, 
      "max_abs_error_units": "J/mol", 
      "type": "rational_polynomial"
    }, 
    "hLV": {
      "A": [
        371.5289910589138, 
        -571.9456578146065, 
        451.6088530510513, 
        -197.92198583824626, 
        51.0815547508716, 
        -7.8258724969299225, 
        0.6593021950668424, 
        -0.023424947592386735
      ], 
      "B": [
        1, 
        -0.186370437531018
      ], 
      "_note": "coefficients are in increasing order; input in K, output in J/mol; value is enthalpy minus hs_anchor enthalpy", 
      "max_abs_error": 0.03436822003364881, 
      "max_abs_error_units": "J/mol", 
      "type": "rational_polynomial"
    }, 
    "melting_line": {
      "BibTeX": "Datchi-PRB-2000", 
      "T_m": 1.15, 
      "parts": [
        {
          "T_0": 1, 
          "T_max": 700, 
          "T_min": 2.1768, 
          "a": 1606700.0, 
          "c": 1.565, 
          "p_0": -1606700.0
        }
      ], 
      "type": "Simon"
    }, 
    "pL": {
      "T_r": 5.1953, 
      "Tmax": 5.195299999999987, 
      "Tmin": 2.1768000000000103, 
      "description": "p' = pc*exp(Tc/T*sum(n_i*theta^t_i))", 
      "max_abserror_percentage": 0.009046990251626585, 
      "n": [
        -2.5589967099484343, 
        -2.1208869241528903, 
        2.0304814035943877, 
        0.9702906562630098, 
        -0.006217789170073319, 
        -4.338734244510393
      ], 
      "reducing_value": 227600.0, 
      "t": [
        0.981, 
        1.13, 
        1.536, 
        3.109, 
        0.338, 
        14.431
      ], 
      "type": "pL", 
      "using_tau_r": true
    }, 
    "pV": {
      "T_r": 5.1953, 
      "Tmax": 5.195299999999987, 
      "Tmin": 2.1768000000000103, 
      "description": "p'' = pc*exp(Tc/T*sum(n_i*theta^t_i))", 
      "max_abserror_percentage": 0.009844391348079462, 
      "n": [
        2.1680719893011937, 
        -5.75952731195631, 
        1.295833335273841, 
        0.42681936101289836, 
        0.49626229940990035, 
        -11.083693322102567
      ], 
      "reducing_value": 227600.0, 
      "t": [
        0.896, 
        0.945, 
        2.116, 
        2.72, 
        6.555, 
        14.771
      ], 
      "type": "pV", 
      "using_tau_r": true
    }, 
    "rhoL": {
      "T_r": 5.1953, 
      "Tmax": 5.195299999999987, 
      "Tmin": 2.1768000000000103, 
      "description": "rho' = rhoc*(1+sum(n_i*theta^t_i))", 
      "max_abserror_percentage": 0.01468301830127583, 
      "n": [
        1.8225767219916278, 
        -0.5212838519553242, 
        0.2130685389843537, 
        -0.44861224586106435, 
        5.329845315529739, 
        -10.020970811883176
      ], 
      "reducing_value": 18130.0, 
      "t": [
        0.402, 
        0.491, 
        0.941, 
        1.784, 
        8.213, 
        9.042
      ], 
      "type": "rhoLnoexp", 
      "using_tau_r": false
    }, 
    "rhoV": {
      "T_r": 5.1953, 
      "Tmax": 5.195299999999987, 
      "Tmin": 2.1768000000000103, 
      "description": "rho'' = rhoc*exp(Tc/T*sum(n_i*theta^t_i))", 
      "max_abserror_percentage": 0.0694378509351723, 
      "n": [
        -0.8412289332631507, 
        -3.590072534944493, 
        2.2788760536554777, 
        -1.4459129841887175, 
        2.0638632716793297, 
        -14.547720153618606
      ], 
      "reducing_value": 18130.0, 
      "t": [
        0.211, 
        0.693, 
        0.749, 
        1.118, 
        1.846, 
        19.915
      ], 
      "type": "rhoV", 
      "using_tau_r": true
    }, 
    "sL": {
      "A": [
        -205.83355711479925, 
        349.2990053067296, 
        -275.68259549746017, 
        122.56872955362479, 
        -32.63350575596284, 
        5.1905810489487925, 
        -0.456408277860071, 
        0.01710499562467409
      ], 
      "B": [
        1, 
        -0.17644509500055094
      ], 
      "_note": "coefficients are in increasing order; input in K, output in J/mol/K; value is entropy minus hs_anchor entropy", 
      "max_abs_error": 0.009621826373439113, 
      "max_abs_error_units": "J/mol/K", 
      "type": "rational_polynomial"
    }, 
    "sLV": {
      "A": [
        339.49787735366624, 
        -514.5161442734804, 
        380.77980301777467, 
        -163.118964862231, 
        42.360852162655526, 
        -6.612392146177472, 
        0.572543686217766, 
        -0.021164101060777908
      ], 
      "B": [
        1, 
        -0.18207432736961326
      ], 
      "_note": "coefficients are in increasing order; input in K, output in J/mol/K; value is entropy minus hs_anchor entropy", 
      "max_abs_error": 0.014376220853541177, 
      "max_abs_error_units": "J/mol/K", 
      "type": "rational_polynomial"
    }, 
    "surface_tension": {
      "BibTeX": "Mulero-JPCRD-2012", 
      "Tc": 5.1953, 
      "a": [
        0.0004656, 
        0.001889, 
        -0.002006
      ], 
      "description": "sigma = sum(a_i*(1-T/Tc)^n_i)", 
      "n": [
        1.04, 
        2.468, 
        2.661
      ]
    }
  }, 
  "CAS": "7440-59-7", 
  "ENVIRONMENTAL": {
    "ASHRAE34": "A1", 
    "FH": 0, 
    "GWP100": -1.0, 
    "GWP20": -1.0, 
    "GWP500": -1.0, 
    "HH": 0, 
    "Name": "Helium", 
    "ODP": -1.0, 
    "PH": 0
  }, 
  "EOS": [
    {
      "BibTeX_CP0": "", 
      "BibTeX_EOS": "OrtizVega-2010", 
      "STATES": {
        "hs_anchor": {
          "T": 5.71483, 
          "T_units": "K", 
          "hmolar": 65.07644974233118, 
          "hmolar_units": "J/mol", 
          "p": 310512.8409251611, 
          "p_units": "Pa", 
          "rhomolar": 15645.330000000002, 
          "rhomolar_units": "mol/m^3", 
          "smolar": 11.035848301503266, 
          "smolar_units": "J/mol/K"
        }, 
        "reducing": {
          "T": 5.1953, 
          "T_units": "K", 
          "p": 227600, 
          "p_units": "Pa", 
          "rhomolar": 17383.7, 
          "rhomolar_units": "mol/m^3"
        }, 
        "sat_min_liquid": {
          "T": 2.1768, 
          "T_units": "K", 
          "p": 5.04275718944867, 
          "p_units": "Pa", 
          "rhomolar": 36459.66840252621, 
          "rhomolar_units": "mol/m^3"
        }, 
        "sat_min_vapor": {
          "T": 2.1768, 
          "T_units": "K", 
          "p": 5.04275718944867, 
          "p_units": "Pa", 
          "rhomolar": 293.3016136659702, 
          "rhomolar_units": "mol/m^3"
        }
      }, 
      "T_max": 2000, 
      "T_max_units": "K", 
      "Ttriple": 2.1768, 
      "Ttriple_units": "K", 
      "accentric": -0.385, 
      "accentric_units": "-", 
      "alpha0": [
        {
          "a1": 0.1871304489697973, 
          "a2": 0.4848903984696551, 
          "type": "IdealGasHelmholtzLead"
        }, 
        {
          "a": 1.5, 
          "type": "IdealGasHelmholtzLogTau"
        }, 
        {
          "a1": -0.0278608575394308, 
          "a2": -0.00835828466224539, 
          "reference": "NBP", 
          "type": "IdealGasHelmholtzEnthalpyEntropyOffset"
        }
      ], 
      "alphar": [
        {
          "d": [
            4, 
            1, 
            1, 
            2, 
            2, 
            3, 
            1, 
            1, 
            3, 
            2, 
            2, 
            1
          ], 
          "l": [
            0, 
            0, 
            0, 
            0, 
            0, 
            0, 
            1, 
            2, 
            2, 
            1, 
            2, 
            1
          ], 
          "n": [
            0.014799269, 
            3.06281562, 
            -4.25338698, 
            0.05192797, 
            -0.165087335, 
            0.087236897, 
            2.10653786, 
            -0.6283503, 
            -0.28200301, 
            1.04234019, 
            -0.07620555, 
            -1.35006365
          ], 
          "t": [
            1.0, 
            0.426, 
            0.631, 
            0.596, 
            1.705, 
            0.568, 
            0.9524, 
            1.471, 
            1.48, 
            1.393, 
            3.863, 
            0.803
          ], 
          "type": "ResidualHelmholtzPower"
        }, 
        {
          "beta": [
            8.005, 
            1.15, 
            2.143, 
            0.147, 
            0.154, 
            0.701, 
            0.21, 
            0.134, 
            19.256
          ], 
          "d": [
            1, 
            1, 
            1, 
            2, 
            2, 
            2, 
            3, 
            2, 
            2
          ], 
          "epsilon": [
            0.912, 
            0.79, 
            0.90567, 
            5.1136, 
            3.6022, 
            0.6488, 
            4.2753, 
            2.744, 
            0.8736
          ], 
          "eta": [
            8.674, 
            4.006, 
            8.1099, 
            0.1449, 
            0.1784, 
            2.432, 
            0.0414, 
            0.421, 
            5.8575
          ], 
          "gamma": [
            1.1475, 
            1.7036, 
            1.6795, 
            0.9512, 
            4.475, 
            2.7284, 
            1.7167, 
            1.5237, 
            0.7649
          ], 
          "n": [
            0.11997252, 
            0.107245, 
            -0.35374839, 
            0.75348862, 
            0.00701871, 
            0.226283167, 
            -0.22464733, 
            0.12413584, 
            0.00901399
          ], 
          "t": [
            3.273, 
            0.66, 
            2.629, 
            1.4379, 
            3.317, 
            2.3676, 
            0.7545, 
            1.353, 
            1.982
          ], 
          "type": "ResidualHelmholtzGaussian"
        }
      ], 
      "gas_constant": 8.314472, 
      "gas_constant_units": "J/mol/K", 
      "molar_mass": 0.004002602, 
      "molar_mass_units": "kg/mol", 
      "p_max": 1000000000, 
      "p_max_units": "Pa", 
      "pseudo_pure": false
    }
  ], 
  "NAME": "Helium", 
  "REFPROP_NAME": "HELIUM", 
  "STATES": {
    "critical": {
      "T": 5.1953, 
      "T_units": "K", 
      "p": 227600.0, 
      "p_units": "Pa", 
      "rhomolar": 18130.0, 
      "rhomolar_units": "mol/m^3"
    }, 
    "triple_liquid": {
      "T": 2.1768, 
      "T_units": "K", 
      "p": 5.04275718944867, 
      "p_units": "Pa", 
      "rhomolar": 36459.66840252621, 
      "rhomolar_units": "mol/m^3"
    }, 
    "triple_vapor": {
      "T": 2.1768, 
      "T_units": "K", 
      "p": 5.04275718944867, 
      "p_units": "Pa", 
      "rhomolar": 293.3016136659702, 
      "rhomolar_units": "mol/m^3"
    }
  }, 
  "TRANSPORT": {
    "conductivity": {
      "BibTeX": "HANDS-CRYO-1981", 
      "hardcoded": "Helium"
    }, 
    "viscosity": {
      "BibTeX": "ARP-NIST-1998", 
      "hardcoded": "Helium"
    }
  }
}