{
  "ALIASES": [
    "helium", 
    "HELIUM", 
    "He"
  ], 
  "ANCILLARIES": {
    "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": [
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        -2.1208869241528903, 
        2.0304814035943877, 
        0.9702906562630098, 
        -0.006217789170073319, 
        -4.338734244510393
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      "reducing_value": 227600.0, 
      "t": [
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        1.13, 
        1.536, 
        3.109, 
        0.338, 
        14.431
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      "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": [
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        -5.75952731195631, 
        1.295833335273841, 
        0.42681936101289836, 
        0.49626229940990035, 
        -11.083693322102567
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      "reducing_value": 227600.0, 
      "t": [
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        0.945, 
        2.116, 
        2.72, 
        6.555, 
        14.771
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      "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
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      "reducing_value": 18130.0, 
      "t": [
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        0.491, 
        0.941, 
        1.784, 
        8.213, 
        9.042
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      "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
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      "reducing_value": 18130.0, 
      "t": [
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        0.749, 
        1.118, 
        1.846, 
        19.915
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      "type": "rhoV", 
      "using_tau_r": true
    }, 
    "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", 
      "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"
        }
      ], 
      "alphar": [
        {
          "d": [
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            1, 
            1, 
            2, 
            2, 
            3, 
            1, 
            1, 
            3, 
            2, 
            2, 
            8
          ], 
          "l": [
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            0, 
            0, 
            0, 
            0, 
            0, 
            1, 
            2, 
            2, 
            1, 
            2, 
            1
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          "n": [
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          "type": "ResidualHelmholtzPower"
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        {
          "beta": [
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            9.3799, 
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            0.0061, 
            0.3581, 
            0.7518, 
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          "d": [
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            1, 
            2, 
            2, 
            2, 
            3, 
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            2
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          "epsilon": [
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            0.8787, 
            2.7182, 
            2.0301, 
            0.89, 
            1.179, 
            0.568, 
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          "eta": [
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            0.2832, 
            6.0582, 
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            0.0539, 
            0.185, 
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          "gamma": [
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            1.2896, 
            0.3577
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          "n": [
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            -0.0545401, 
            -0.0368726, 
            -0.001021851, 
            0.06166348, 
            0.02493437, 
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            -0.008233032
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          "t": [
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            1, 
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            1, 
            1, 
            2, 
            1
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          "type": "ResidualHelmholtzGaussian"
        }
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      "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, 
      "ptriple": 5042.757189, 
      "ptriple_units": "Pa", 
      "reducing_state": {
        "T": 5.1953, 
        "T_units": "K", 
        "p": 227600, 
        "p_units": "Pa", 
        "rhomolar": 18130, 
        "rhomolar_units": "mol/m^3"
      }, 
      "rhoLtriple": 36459.45454859136, 
      "rhoLtriple_units": "mol/m^3", 
      "rhoVtriple": 293.9108313933456, 
      "rhoVtriple_units": "mol/m^3"
    }
  ], 
  "NAME": "Helium"
}