{
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    "argon", 
    "ARGON"
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      "_note": "coefficients are in increasing order; input in K, output in J/mol; value is enthalpy minus hs_anchor enthalpy", 
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      "type": "rational_polynomial"
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      "molar_mass_units": "kg/mol", 
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  "NAME": "Argon", 
  "REFPROP_NAME": "ARGON", 
  "STATES": {
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  "TRANSPORT": {
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      "dilute": {
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        "type": "polynomial_and_exponential"
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    "viscosity": {
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      "dilute": {
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        "type": "collision_integral"
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      "epsilon_over_k": 143.2, 
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      "higher_order": {
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        "a": [
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        "rhomolar_reduce": 13407.43, 
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        "type": "modified_Batschinski_Hildebrand"
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      "sigma_eta": 3.35e-10, 
      "sigma_eta_units": "m"
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}