{
  "ALIASES": [], 
  "ANCILLARIES": {
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        1.2761771435550759e-12
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        -0.0021187281864226597
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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": 122.05182245537617, 
      "max_abs_error_units": "J/mol", 
      "type": "rational_polynomial"
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        0.001553226052993154, 
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        2.740981548826963e-09, 
        -1.1451726850511885e-12
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        -0.002152572157503695
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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": 174.81352909447241, 
      "max_abs_error_units": "J/mol", 
      "type": "rational_polynomial"
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      "Tmax": 451.47999999999917, 
      "Tmin": 200.0, 
      "description": "p' = pc*exp(Tc/T*sum(n_i*theta^t_i))", 
      "max_abserror_percentage": 0.05826785438975968, 
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        -2744.0923786590133
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      "reducing_value": 5181200.0, 
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        3.236, 
        19.172, 
        19.986
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      "type": "pL", 
      "using_tau_r": true
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      "Tmax": 451.47999999999917, 
      "Tmin": 200.0, 
      "description": "p'' = pc*exp(Tc/T*sum(n_i*theta^t_i))", 
      "max_abserror_percentage": 0.06815685685508388, 
      "n": [
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        -6.563138713373014, 
        4.137852310206907, 
        -6.289887616085091, 
        0.10742860069097583, 
        -79.5502994261936
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      "reducing_value": 5181200.0, 
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        2.079, 
        2.561, 
        2.725, 
        15.503
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      "type": "pV", 
      "using_tau_r": true
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      "Tmax": 451.47999999999917, 
      "Tmin": 200.0, 
      "description": "rho' = rhoc*(1+sum(n_i*theta^t_i))", 
      "max_abserror_percentage": 2.527142850874342, 
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        216673.96540670822
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      "reducing_value": 5110.765599999999, 
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      "type": "rhoLnoexp", 
      "using_tau_r": false
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      "Tmax": 451.47999999999917, 
      "Tmin": 200.0, 
      "description": "rho'' = rhoc*exp(Tc/T*sum(n_i*theta^t_i))", 
      "max_abserror_percentage": 2.171498053602172, 
      "n": [
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        -10.046553362223358, 
        -16.99517541299311, 
        222.23399842968522, 
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      "type": "rhoV", 
      "using_tau_r": true
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        62.04946912486972, 
        -0.5735396470302134, 
        0.0029481565502497064, 
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        7.002045573082725e-15
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      "B": [
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        -0.0019832057412947925
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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": 0.4365708283127496, 
      "max_abs_error_units": "J/mol/K", 
      "type": "rational_polynomial"
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        0.6194711480374648, 
        -0.0031103170386885333, 
        9.361628959254205e-06, 
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        1.667526719107901e-11, 
        -7.033672881327671e-15
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        -0.002103652186797974
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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": 0.6194961166472908, 
      "max_abs_error_units": "J/mol/K", 
      "type": "rational_polynomial"
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    "surface_tension": {
      "BibTeX": "Mulero-JPCRD-2012", 
      "Tc": 451.48, 
      "a": [
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      "description": "sigma = sum(a_i*(1-T/Tc)^n_i)", 
      "n": [
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  "CAS": "75-43-4", 
  "ENVIRONMENTAL": {
    "ASHRAE34": "B1", 
    "FH": -1, 
    "GWP100": 151.0, 
    "GWP20": 530.0, 
    "GWP500": 46.0, 
    "HH": -1, 
    "Name": "R21", 
    "ODP": -1.0, 
    "PH": -1
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      "BibTeX_CP0": "Platzer-BOOK-1990", 
      "BibTeX_EOS": "Platzer-BOOK-1990", 
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        "sat_min_liquid": {
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        "sat_min_vapor": {
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          "rhomolar": 0.5254904978375974, 
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      "T_max": 473, 
      "T_max_units": "K", 
      "Ttriple": 142.8, 
      "Ttriple_units": "K", 
      "accentric": 0.2061, 
      "accentric_units": "-", 
      "alpha0": [
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          "type": "IdealGasHelmholtzLead"
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        {
          "a": -1, 
          "type": "IdealGasHelmholtzLogTau"
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        {
          "T0": 298.15, 
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          "type": "IdealGasHelmholtzCP0PolyT"
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        {
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          "a2": 12.6393155496886, 
          "reference": "IIR", 
          "type": "IdealGasHelmholtzEnthalpyEntropyOffset"
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      "alphar": [
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          "type": "ResidualHelmholtzPower"
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        {
          "d": [
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          "g": [
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          "n": [
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          "t": [
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          "type": "ResidualHelmholtzExponential"
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      "gas_constant": 8.31451, 
      "gas_constant_units": "J/mol/K", 
      "molar_mass": 0.1029227, 
      "molar_mass_units": "kg/mol", 
      "p_max": 138000000, 
      "p_max_units": "Pa", 
      "pseudo_pure": false
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  ], 
  "NAME": "R21", 
  "REFPROP_NAME": "R21", 
  "STATES": {
    "critical": {
      "T": 451.48, 
      "T_units": "K", 
      "p": 5181200.0, 
      "p_units": "Pa", 
      "rhomolar": 5110.765599999999, 
      "rhomolar_units": "mol/m^3"
    }, 
    "triple_liquid": {}, 
    "triple_vapor": {}
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}