{
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      "type": "rational_polynomial"
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      "description": "sigma = sum(a_i*(1-T/Tc)^n_i)", 
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  "CAS": "75-72-9", 
  "ENVIRONMENTAL": {
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    "FH": -1, 
    "GWP100": 14400.0, 
    "GWP20": 10800.0, 
    "GWP500": 16400.0, 
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    "Name": "R13", 
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      "BibTeX_EOS": "Platzer-BOOK-1990", 
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      "Ttriple": 92, 
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          "type": "ResidualHelmholtzPower"
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        {
          "d": [
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          "g": [
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          "type": "ResidualHelmholtzExponential"
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      "gas_constant": 8.31451, 
      "gas_constant_units": "J/mol/K", 
      "molar_mass": 0.104459, 
      "molar_mass_units": "kg/mol", 
      "p_max": 50000000, 
      "p_max_units": "Pa", 
      "pseudo_pure": false
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  "NAME": "R13", 
  "REFPROP_NAME": "R13", 
  "STATES": {
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      "p": 3879000.0, 
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      "rhomolar": 5580.0, 
      "rhomolar_units": "mol/m^3"
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    "triple_liquid": {
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      "hmolar": -1985.7238635857523, 
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      "rhomolar_units": "mol/m^3", 
      "smolar": -46.51546235646923, 
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    "triple_vapor": {
      "T": 98.15, 
      "T_units": "K", 
      "hmolar": 23951.607995399307, 
      "hmolar_units": "J/mol", 
      "p": 0.9055738873950259, 
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      "rhomolar": 0.001109681689676505, 
      "rhomolar_units": "mol/m^3", 
      "smolar": 217.74669600212772, 
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  }, 
  "TRANSPORT": {
    "conductivity": {
      "BibTeX": "Huber-IECR-2003", 
      "f_int": {
        "T_reducing": 1.0, 
        "T_reducing_units": "K", 
        "a": [
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        "t": [
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      "psi": {
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        "rhomolar_reducing": 5580.0, 
        "rhomolar_reducing_units": "mol/m^3", 
        "t": [
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      }, 
      "q_D": 2860117379.217243, 
      "q_D_units": "m", 
      "reference_fluid": "Propane", 
      "type": "ECS"
    }, 
    "viscosity": {
      "BibTeX": "Huber-IECR-2003", 
      "epsilon_over_k": 204.0, 
      "epsilon_over_k_units": "K", 
      "psi": {
        "a": [
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        "rhomolar_reducing": 5580.0, 
        "rhomolar_reducing_units": "mol/m^3", 
        "t": [
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      }, 
      "reference_fluid": "Propane", 
      "sigma_eta": 4.971e-10, 
      "sigma_eta_units": "m", 
      "type": "ECS"
    }
  }
}