{
  "ALIASES": [
    "CH4", 
    "methane", 
    "METHANE"
  ], 
  "ANCILLARIES": {
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        -1.5024500877134693e-11
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      "B": [
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        -0.005196111759500481
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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": 54.067803948321625, 
      "max_abs_error_units": "J/mol", 
      "type": "rational_polynomial"
    }, 
    "hLV": {
      "A": [
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        1186.3368022293175, 
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        0.3900250739533009, 
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        1.4028003780078683e-05, 
        -3.5732308622188016e-08, 
        3.8799836766955634e-11
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      "B": [
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        -0.005194418796026418
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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": 126.5548829879591, 
      "max_abs_error_units": "J/mol", 
      "type": "rational_polynomial"
    }, 
    "melting_line": {
      "BibTeX": "Abramson-HPR-2011", 
      "T_m": 90.7, 
      "parts": [
        {
          "T_0": 90.6941, 
          "T_max": 600, 
          "T_min": 90.6941, 
          "a": 208000000.0, 
          "c": 1.698, 
          "p_0": 11700.0
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      "type": "Simon"
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    "pL": {
      "T_r": 190.564, 
      "Tmax": 190.56399999999954, 
      "Tmin": 90.69410000000002, 
      "description": "p' = pc*exp(Tc/T*sum(n_i*theta^t_i))", 
      "max_abserror_percentage": 0.013146758390991664, 
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        -81.28318843036807, 
        82.94698441608203, 
        -2.6879045537986053, 
        -5.671070893658749, 
        4.700510293996553
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      "reducing_value": 4599200.0, 
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        1.438, 
        1.98, 
        6.338, 
        6.911
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      "type": "pL", 
      "using_tau_r": true
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    "pV": {
      "T_r": 190.564, 
      "Tmax": 190.56399999999954, 
      "Tmin": 90.69410000000002, 
      "description": "p'' = pc*exp(Tc/T*sum(n_i*theta^t_i))", 
      "max_abserror_percentage": 0.0043709218045084874, 
      "n": [
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        -7.477611035699516, 
        2.8218785804602344, 
        -0.3138277099613026, 
        -14.181166200304828, 
        13.10811727353235
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      "reducing_value": 4599200.0, 
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        3.176, 
        5.616, 
        5.744
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      "type": "pV", 
      "using_tau_r": true
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    "rhoL": {
      "T_r": 190.564, 
      "Tmax": 190.56399999999954, 
      "Tmin": 90.69410000000002, 
      "description": "rho' = rhoc*(1+sum(n_i*theta^t_i))", 
      "max_abserror_percentage": 0.03816630998332293, 
      "n": [
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        1.137482950365497, 
        0.25267850508364803, 
        -0.15127345979918666, 
        11.30484305385285, 
        -1807.5949062134612
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      "reducing_value": 10139.127999999999, 
      "t": [
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        3.858, 
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      "type": "rhoLnoexp", 
      "using_tau_r": false
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      "Tmax": 190.56399999999954, 
      "Tmin": 90.69410000000002, 
      "description": "rho'' = rhoc*exp(Tc/T*sum(n_i*theta^t_i))", 
      "max_abserror_percentage": 0.043503419703461166, 
      "n": [
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        24.278993697870174, 
        -25.256402428812585, 
        -0.17494067187770526, 
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      "type": "rhoV", 
      "using_tau_r": true
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        -0.00039155103227860277, 
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        -1.909772434907866e-08, 
        5.196362652403247e-11, 
        -5.912280199948305e-14
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      "B": [
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      "_note": "coefficients are in increasing order; input in K, output in J/mol/K; value is entropy minus hs_anchor entropy", 
      "max_abs_error": 0.28097974837886586, 
      "max_abs_error_units": "J/mol/K", 
      "type": "rational_polynomial"
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        2.673313161623893e-07, 
        1.2852572768858844e-08, 
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      "_note": "coefficients are in increasing order; input in K, output in J/mol/K; value is entropy minus hs_anchor entropy", 
      "max_abs_error": 0.6663601546949187, 
      "max_abs_error_units": "J/mol/K", 
      "type": "rational_polynomial"
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    "surface_tension": {
      "BibTeX": "Mulero-JPCRD-2012", 
      "Tc": 190.564, 
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        -0.006024, 
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      "description": "sigma = sum(a_i*(1-T/Tc)^n_i)", 
      "n": [
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  "CAS": "74-82-8", 
  "ENVIRONMENTAL": {
    "ASHRAE34": "A3", 
    "FH": 4, 
    "GWP100": 25.0, 
    "GWP20": 72.0, 
    "GWP500": 7.6, 
    "HH": 0, 
    "Name": "Methane", 
    "ODP": -1.0, 
    "PH": 0
  }, 
  "EOS": [
    {
      "BibTeX_CP0": "", 
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          "rhomolar": 9125.2152, 
          "rhomolar_units": "mol/m^3", 
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          "p": 4599200, 
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          "rhomolar": 10139.128, 
          "rhomolar_units": "mol/m^3"
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        "sat_min_liquid": {
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          "T_units": "K", 
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          "rhomolar": 28141.91479265917, 
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        "sat_min_vapor": {
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      "T_max": 625, 
      "T_max_units": "K", 
      "Ttriple": 90.6941, 
      "Ttriple_units": "K", 
      "accentric": 0.01142, 
      "accentric_units": "-", 
      "alpha0": [
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          "type": "IdealGasHelmholtzLead"
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        {
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        {
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          "type": "IdealGasHelmholtzPlanckEinstein"
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        {
          "beta": [
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          "epsilon": [
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          "eta": [
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          "gamma": [
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          "type": "ResidualHelmholtzGaussian"
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      "gas_constant": 8.31451, 
      "gas_constant_units": "J/mol/K", 
      "molar_mass": 0.0160428, 
      "molar_mass_units": "kg/mol", 
      "p_max": 1000000000, 
      "p_max_units": "Pa", 
      "pseudo_pure": false
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  ], 
  "NAME": "Methane", 
  "REFPROP_NAME": "METHANE", 
  "STATES": {
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      "T": 190.564, 
      "T_units": "K", 
      "p": 4599200.0, 
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      "rhomolar": 10139.127999999999, 
      "rhomolar_units": "mol/m^3"
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    "triple_liquid": {
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      "rhomolar": 28141.91479265917, 
      "rhomolar_units": "mol/m^3"
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    "triple_vapor": {
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      "rhomolar": 15.62969180971744, 
      "rhomolar_units": "mol/m^3"
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}