Properties of Various Ideal Gases (at 300 K)
    Gas Formula Molar Mass Gas constant Specific Heat
    at Const. Press.         		Specific Heat
    at Const. Vol.         		Specific Heat
    Ratio
    * *
    M[kg/kmol]
    R[kJ/kg.K]
    Cp[kJ/kg.K]
    Cv[kJ/kg.K]
    k = Cp/Cv
    Air
    --

    28.97

    0.287

    1.005

    0.718

    1.4

    Argon
    Ar

    39.948

    0.2081

    0.5203

    0.3122

    1.667

    Butane
    C4H10

    58.124

    0.1433

    1.7164

    1.5734

    1.091

    Carbon Dioxide
    CO2

    44.01

    0.1889

    0.846

    0.657

    1.289

    Carbon Monoxide
    CO

    28.011

    0.2968

    1.04

    0.744

    1.4

    Ethane
    C2H6

    30.07

    0.2765

    1.7662

    1.4897

    1.186

    Ethylene
    C2H4

    28.054

    0.2964

    1.5482

    1.2518

    1.237

    Helium
    He

    4.003

    2.0769

    5.1926

    3.1156

    1.667

    Hydrogen
    H2

    2.016

    4.124

    14.307

    10.183

    1.405

    Methane
    CH4

    16.043

    0.5182

    2.2537

    1.7354

    1.299

    Neon
    Ne

    20.183

    0.4119

    1.0299

    0.6179

    1.667

    Nitrogen
    N2

    28.013

    0.2968

    1.039

    0.743

    1.4

    Octane
    C8H18

    114.231

    0.0729

    1.7113

    1.6385

    1.044

    Oxygen
    O2

    31.999

    0.2598

    0.918

    0.658

    1.395

    Propane
    C3H8

    44.097

    0.1885

    1.6794

    1.4909

    1.126

    Steam
    H2O

    18.015

    0.4615

    1.8723

    1.4108

    1.327

    Adapted from TEST ( T he E xpert S ystem for T hermodynamics) < www.thermofluids.net > by S.Bhattacharjee, San Diego State University

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